It is better to look younger, and you will GREATLY appreciate this one day. I have always looked young for my age. Even now people think I am 15 to 20 years younger than I am. It is WONDERFUL! Truly a gift. You may not like it now, but you will. I have always liked it.
What would suck is being 25 and people thinking you're 30 or 35! Just think what you will look like at 40 and 50! GROSS! Not to mention 60 and 70!
It's better to look younger because if your 30 and look 22 the older you get your not going to look that old. If your 22 and look 30 when you actually reach 30 who knows people might mistake your for 40.