Training for a Triathlon ?

Kaylay asked: Okay I am 15 years old and I want to start training for a triathlon. I need a few tips on training. Like I know I need to practice swimming, running and cycling but if anyone knows a good workout for me, that would be much appreciated. Oh and I also have a [...]

Is it still realistic to train for an olympic triathlon at age 18? ?

giftofthetrees asked: I used to play football so I am in pretty good shape. I am more athletic then bulky.
… to begin training…