and age. Many older guys have told me it's hard to not have a belly once you're past 30. It's kinda scary to think that you metabolism will suddenly drop in half once you reach a ceratin age.
It's very true in my experience. I've been working out hard core since March and I'm only really halfway to my goal (I'm 31 1/2 for reference). When I was 19 and in college (hello bad for you cafeteria food) I lost more weight in a quicker timeframe with less effort. I was down to 175 which on my frame made me look too damn skinny. Fast forward a decade later and I'm still chilling at 215 after much work. Keep in mind I was bigger when I started working out in college than I was when I started working out this time.
I'm with MAF, cherish your youth. I was just talking to a coworker today as he was asking how I lost so much weight. He was getting down on himself because he couldn't stay motivated, and I think the main point I was able to pass on to him was that he had so many advantages on me that he shouldn't get discouraged. Being 22 he still has plenty of time to lose the weight, and not to lose focus.
Another disadvantage to waiting till you're older to lose weight is that after 30 or so your skin starts to lose elasticity. I'm hoping my skin will go back to it's original tautness, but I don't really expect it to. Better to just stay on top of your health at an early age rather than try and reverse the cycle later on.
The longer you wait, the harder it gets.