The real question is not your age, but the wrinkle
Botulinum toxin — often called 'Botox', after one of the brand names — acts on expression lines: frown lines (between the eyebrows), forehead lines and crow's feet. By temporarily relaxing the muscle responsible, it smooths the wrinkle that the muscle carves.
The indication therefore does not depend on the age on your ID card, but on a clinical observation: is the wrinkle starting to persist at rest, once the face is relaxed?
The main stages, as a rough guide
Before 30: rarely justified
In a young face, expression lines disappear completely at rest. An injection then brings little visible benefit. Except in particular cases (a frown line deeply marked at an early age, permanent frowning giving a stern look, excessive sweating treated medically), it is reasonable to wait.
30–40: the most common time to start
This is typically the age when lines start to remain slightly visible at rest. One or two sessions a year are often enough to keep the forehead smooth without freezing expression. This is also where the notion of 'preventive' treatment makes reasonable sense: by limiting repeated muscle contraction, you slow down the deepening of the line — without claiming to prevent it for good.
After 45–50: still useful, but rarely on its own
The toxin remains effective on the muscular component of wrinkles. But over the years, volume loss, skin laxity and changes in skin quality come into play, and these call for other answers: hyaluronic acid, peels, or even surgery (face and neck lift) when sagging dominates. The right treatment plan looks at the face as a whole.
What to know before a first injection
- A medical procedure: in France, aesthetic botulinum toxin injections may only be performed by qualified doctors. A prior consultation is essential — facial analysis, screening for contraindications, information on the expected effects.
- A gradual, temporary result: the effect sets in over 3 to 10 days and lasts 4 to 6 months on average. A touch-up may be offered at 15 days if necessary.
- A natural-looking goal: a good injection relaxes expression without switching it off. A completely frozen forehead is not a medically desirable objective.
- Contraindications: pregnancy and breastfeeding, certain neuromuscular diseases, and skin infection in the injection area, among others.
How much does it cost?
In Paris, a botulinum toxin session costs from €400 (one vial), depending on the number of areas treated — see the full fee schedule. Two sessions a year are usually enough for maintenance. Aesthetic procedures are not covered by the French public health insurance.
Does starting early make you dependent?
No — the toxin creates no physiological dependence. If you stop, the muscles gradually regain their mobility and the wrinkles simply resume their natural course, no more, no less. The 'dependence' sometimes mentioned is aesthetic: you get used to a smooth forehead.
Key takeaways
- No universal age: the indication arises when the wrinkle persists at rest
- In practice, most first injections take place between 30 and 45
- Effect within a few days, lasting 4 to 6 months, about 2 sessions a year
- A medical procedure, with a prior consultation and a natural result as the goal
To find out whether botulinum toxin suits your face — or whether another approach would serve you better — book a consultation with Pr Ignacio Garrido in Paris 16.