Well we need some more info. You say you're 14, but what is your height/weight? At 14, I was really tall for my age (like 5'9" or 5'10") so the standards didn't apply.
it's really up to you, you know your body. Do you think you'd be able to handle 15# equipment or would you be throwing way too slow or too hard for you? I'd suggest getting a ball in 14#, throwing it for a while and see. Then, you'll be able to tell if you could handle a 15 pounder, or just stay with 14.
--------------------
- Andy
Brunswick...........'nuff said.