How to make myself look younger?

This may sound mad but I have a younger boyfriend (only two years) but I am getting sick of people always commenting on how old I look compared to him like I am 50 or something (I am only 21) a bouncer once said I look about 30 and it really upset me! My bf said I look "distinguished and confident" which makes me appear older than my years. I don't smoke/drink alcohol or caffeine, don't stay up late, regularly exercise etc. What can I do to my appearance to help me look younger? thanks :)