There is no age limit for botox injections, as long as it is used to treat motionless wrinkles that may appear early or be delayed. Meaning that Botox can be injected based on the condition of the skin and wrinkles, and not depending on age, and the results of Botox are not permanent. The muscle consumes botox over time to gradually deplete, and the body’s natural substance (acetylcholine) can take its place again on the surface of the muscles.
This takes 4-6 months. How long the botox lasts depends on the amount of substance injected, the size and location of the muscle that was injected. In the muscle around the eye, the results do not last for more than 4 months, because it is a thin muscle, and thus the amount injected into it is small, while it continues in the socket area for up to 8 months due to the large muscle size that allows for a larger amount of injection.
I am afraid that my face will sag more after the effect of botox! I often hear this comment before botox injections and the answer is exactly the opposite. Wrinkles improve after botox injections even after its effect wears off, because the skin has relaxed for a long time without any wrinkles, so it is a treatment and prevention at the same time.