Simple ways to look better
A balanced diet with lots of fruits and vegetables, protein, and lots of water every day will only help you look better. In addition, making sure your calorie intake is appropriate so that you stay in an normal weight range will also help.
Whether or not you will look younger depends on a number of factors, but it will certainly keep you healthier, which should be priority number one.
Other simple things that really do work:
No smoking or nicotine of any kind