Sure, there is no particular age. It depends on your skin type and everything can be very individual. Anyway, as you know, prevention is better than cure. This means that you can start caring about your skin while it is still smooth and start first rejuvenation procedures as soon as you see the first wrinkles. Fortunately, there are various treatments from Botox to dermal fillers, so that you will be able to find the one most suitable for you.