Answers: I definately think while you're surrounded by school is too young-looking.
I've read that it's better to do it in yoru twenties while you're still young-looking.
It's more obvious when you've have plastic surgery on your face when your elder.
a nose work if you mean to smell this you can do after 20 efficiently but first you have to swot up the ingredients of the different produckts how does it smells.