what part of the body changes firs after the age of 20?

I don't know what part of the body is changing after 20 but you should be fully transformed physically until 20. After you get old some parts of the body get old too, for example instead of growing in height you just drop down. Good luck!

Hmmm, 20 years...at 20 years you should be more interested on how to party and enjoy your life than to ask what "with what do we have to be more careful after the age of 20". Live your life and maybe at 50 or 60 years you shoudl ask your self that. Good luck!

YOur figure needs the most caring. I think. If you put on a few kilos and do not do anything to lose it, later you will not be able to lose it so easily. My normal weight was allways 56-57-58kgs. Since my life is not so stressed I become 60-61. And I can not lose this plus weight. But of course with the age you will be old, if you like it or not. My hair is alredy a little grey. My eyes become worse. ALso I have a few wrinkles on my forehead. You cannot avoid it. But I am alredy 32.

Well in my opinion the first thing to get effected after the age of 20 or in some cases even reaching 20 is hair. You need to be careful about what kind of shampoo you use, proper oiling and diet as well inorder to keep your hair healthy

Well in my opinion the first thing to get effected after the age of 20 or in some cases even reaching 20 is hair. You need to be careful about what kind of shampoo you use, proper oiling and diet as well inorder to keep your hair healthy

Well in my opinion the first thing to get effected after the age of 20 or in some cases even reaching 20 is hair. You need to be careful about what kind of shampoo you use, proper oiling and diet as well inorder to keep your hair healthy