Yeah I'm 20... currently 283 was 288 when I started Alli a couple of weeks ago. It is a program that can definitely work for young guys, just gotta remember to keep under your fat grams per meal and watch the calories. It really isnt what you CAN'T eat on Alli but what you can, because you basically can have whatever you want, albeit in moderation.
What I did right away was cut off all soda. If I do beer it will be light beer, and not much since beer has a lot of calories. Avoid fried foods as much as you can. Set one meal a week to cheat, mine is on a Sunday and I find that this helps.