Why is the Future Expected to be Better?

A few of my friends have mentioned that when they get older they will be glad they don't look the way they do now. Also the way they look now is a reason not to take pictures till they are drop dead beautiful ,and that they don't want to remember their teenage selves which is very sad. When they say this they mean the way their face looks and the shape of their body. They seem to limit themselves like they can't wear certain everyday things till their body is in the the perfect 20 year old shape and say that they can't make themselves look better till they are out of grade school. I find it strange to just wait for changes to happen instead of working for it in the present so that in the NEAR future you look better. Facially-wise as a teenager you will wish you still looked that way at 80 no matter how pimpled, pale, or strange it was ,so quit wasting your precious time being young and enjoy having the face you have now because who knows if it will get better or maybe worse which ruins your hopes and changes your mind about how you once looked. 
                                              
                                                                                                     -Alexa