A clinical guide to facial changes in the fourth decade. The anatomical changes that become more visible, what intervention layers commonly become relevant, and what the cosmetic injectable conversation typically covers for patients in their 40s.
What changes anatomically in the 40s
The 40s typically bring more visible structural change than the 30s. Bone resorption begins more meaningfully, particularly in the mid face. Fat pad redistribution becomes more visible; the cheek area volume that the patient had at 30 has shifted, often appearing as flattening of the upper cheek combined with slight prominence of the lower cheek. The nasolabial fold becomes more present at rest. The jawline begins to lose definition as supporting tissue migrates downward. Skin elasticity changes are now visible to the patient as well as to observers.
Static lines that were just appearing in the 30s become more established in the 40s. The forehead, glabella (between the eyebrows), and crows feet areas typically show the most visible static line change. Vertical lip lines begin to appear in some patients, particularly those with significant sun exposure history or smoking history.
The lower face begins to show the early changes that will become more pronounced in the 50s. Marionette lines appear faintly. The corners of the mouth begin to take on a slightly downturned position at rest. The chin may begin to show the bone resorption that gradually changes the lower face proportions.
Skin quality changes accelerate. Texture, brightness, and pigmentation distribution all show more visible change. The cumulative effects of decades of sun exposure become harder to ignore.
What intervention layers commonly become relevant in the 40s
anti-wrinkle treatment in the 40s typically involves higher doses and more areas than in the 30s. Many patients who started conservative anti-wrinkle treatment in their 30s find their dose can remain stable or even reduce slightly because of cumulative muscle response modification. Patients starting in their 40s typically begin with conservative dosing that may need slightly higher doses than typical first treatment patients in their 30s.
Filler treatment becomes meaningfully more relevant in the 40s than in the 30s for many patients. The structural volume loss that the 40s bring is the type of change that filler can address. Common 40s filler indications include cheek area volume restoration, tear trough hollowness, jawline definition support, and chin proportion adjustment. The 40s are typically when many patients have their first filler consultation if they have not already.
Skin quality interventions become more relevant. Patients in their 40s often benefit from prescription skincare, in clinic treatments outside the cosmetic injectable scope (skincare clinics, dermatologists), and increased commitment to sun protection. These are typically discussed at consultation as part of the broader treatment plan conversation even though they are not within Core Aesthetics’ direct service scope.
The 40s consultation conversation
40s consultations typically cover broader anatomical assessment than 30s consultations. The discussion often encompasses multiple areas of concern rather than the single specific concern more common in 30s consultations. The treatment plan, if treatment is recommended, may involve a sequenced approach over several appointments rather than a single intervention.
Patients in their 40s who have had cosmetic injectable treatment elsewhere in earlier decades may arrive with more complex consultation needs. The history of prior treatment shapes current planning; patients who have accumulated filler over years may need a discussion about whether continued additive treatment is the right approach or whether selective dissolution and replanning would better serve their current goals.
Patients in their 40s often have evolving life circumstances that affect treatment planning: career changes, parenting demands, partnership transitions. The consultation engages with the patient as they are now, not with a generic 40s patient profile.
Long horizon planning from the 40s
Patients beginning cosmetic injectable treatment in their 40s typically have a 20-30 year planning horizon ahead. The Core Longevity Plan four phase framework applies straightforwardly: foundation phase in the first year, rhythm phase in years 1-3, adjustment phase in years 3-7 (which may coincide with the late 40s and early 50s when more substantial anatomical change occurs), reassessment phase in years 7-10+ when comprehensive review is built into the plan.
The 40s are typically when patients establish the maintenance pattern that will carry them into later decades. Conservative dosing in the 40s, with built in annual reassessment and willingness to pause or recalibrate, supports the long horizon trajectory better than aggressive treatment that locks in specific aesthetic decisions early.
Clinical accountability and how this guide is reviewed
The clinical content on this page is written and reviewed by Corey Anderson, AHPRA registered nurse (NMW0001047575). The content reflects how Core Aesthetics frames this clinical conversation in practice. Results vary between individuals; the descriptions on this page refer to typical patterns rather than what every patient will experience.
Specific to 40s anatomy content: individual variation is substantial. Some patients in their 40s show changes typically associated with the 50s; others maintain a 30s presentation well into their 40s. The consultation engages with individual anatomy rather than treating chronological age as the primary variable.
Patients can verify Corey Anderson’s AHPRA registration on the public register at ahpra.gov.au using number NMW0001047575. The Core Aesthetics clinic operates from 12A Atherton Road, Oakleigh VIC 3166, by consultation appointment. All new patient treatment at Core Aesthetics follows a structured clinical consultation, consistent with the September 2025 AHPRA cosmetic procedures guidelines. The team page covers the practitioner background.
Is this for you?
Consider booking a consultation if
- Patients in their 40s considering cosmetic injectable treatment for the first time
- Patients in their 40s with treatment history elsewhere who are reassessing their approach
- Patients researching how their face will likely change through the fourth decade
- Patients planning long horizon cosmetic injectable engagement from the 40s
This may not be for you if
- Patients seeking dramatic anti ageing transformation rather than balanced support of natural change
- Patients seeking same day cosmetic injectable treatment without separate consultation
- Patients seeking specific assurances about how their face will age
- Patients under 18 years of age
Suitability is confirmed at consultation. This list is general guidance, not a substitute for clinical assessment.
Frequently asked questions
Is the 40s when most patients start filler?
Filler indications become more common in the 40s than in earlier decades because the structural volume loss that filler addresses typically becomes more visible at this stage. Whether any specific patient should have filler in their 40s depends on their individual anatomy and goals.
Will my anti-wrinkle dose need to increase in my 40s?
Possibly. Patients who started conservative treatment in their 30s often find their dose can remain stable or reduce slightly. Patients starting in their 40s typically have slightly higher first treatment doses than typical 30s first treatments, but conservative dosing principles still apply.
Is it too late to start cosmetic injectable treatment in my 40s?
No. Many patients have their first cosmetic injectable treatment in their 40s and have excellent long term outcomes. The 40s are a typical age for first treatment.
What if I have had filler elsewhere and want to reassess in my 40s?
This is a common reason for consultation in the 40s. The assessment includes review of what has been done previously and discussion of whether continued additive treatment is the right approach or whether selective dissolution and replanning would better serve current goals. The Reassessment phase concept from the Core Longevity Plan applies to mid life patients with treatment history as well as to patients reaching the 7-year mark.
What can cosmetic injectables not do in my 40s?
They cannot reverse ageing, restore the face of an earlier decade, address skin quality concerns that fall outside the injectable scope (texture, pigmentation, broad surface ageing), or change underlying bone structure. They can soften visible changes and support a balanced read of the face during ongoing change.
Will I need more frequent treatments in my 40s than in my 30s?
Not necessarily. Treatment frequency depends on the patient’s individual response and the maintenance pattern that suits them. Some patients have stable intervals across decades; others find their intervals shift. This is discussed at the maintenance review appointments.
What other interventions besides cosmetic injectables become relevant in the 40s?
Skincare and dermatology layers become more important. Sun protection becomes more important. Some patients benefit from in clinic treatments outside the cosmetic injectable scope (skincare clinic treatments, dermatology procedures). These are typically discussed at consultation as part of the broader treatment plan conversation.
Should I plan differently if I am in my late 40s versus early 40s?
The anatomical considerations differ slightly. Early 40s typically still resemble 30s anatomically with subtle additional changes. Late 40s typically show changes that overlap with early 50s. The consultation engages with where the patient sits anatomically rather than relying on chronological age categories.