At the age of 40 is the right time to use anti wrinkle cream. just make sure you don't have an allergy on the cream that you will use.
The question is, how young are you?
As the other suggests 40 or little before is the best time to use anti-wrinkle creams. Apart from using cream you can have antioxidants rich diet. These are the substances that is required for the skin's elasticity.
Antioxidants are found in green vegetables and fruits. Maple syrup contains 65 types of different antioxidants.
It is also good for weight control during pregnancy.