What do you mean you can't get a chick if you look young, trust me that is a lie, I look younger then I really am, but so what I have a girlfriend and I have been with many women younger than me and older then me.
Here are some tips on how to look your age.
Get a hair cut, if you have longer hair cut it short, best would be to ask a girl what she thinks would be a good hair style.
Dress more your age, instead of shirt with massive logos on them, get some shirts with no logos or even polo shirts.
Most guys can grow some facial hair so why not see what happens, five o clock shadows, or even some chin stubble, hell if you can why not grow a full beard.