Suggestion:
Some says once you see wrinkles starting to show on your face. But I think it's better to start early to prevent these wrinkles to show up. I suggest you to buy natural skin care products that works well for anti aging without all those harsh chemicals that may damage your young skin.

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You've got a long time before you need to use anti-aging creme! There is not a certain "number." It depends upon your skin. If you've been sitting in the sun without sunscreen, that damage will start appearing within a few years. Brown spots, fine lines, and blotchy skin could all start popping up in your mid-20's.
You'll want to use products with ingredients that repair the damage. But good anti-aging cremes are expensive because the good ingredients are expensive.
If you're not wearing sunscreen, start. So skip buying the anti-aging creme and buy a good sunscreen instead.
Marie, I'm 24 and I started when I was 19. For the last 3 yrs been using the Isabella Pelle brand. Also suggest you use a mild cleanser like Olay foaming since harsh cleansers leave the skin dry and prone to wrinkles/fine lines.