HEJT2015 - In terms of life experience, don't think you're at a disadvantage due to your age, the first time the FPP re-opened, a lad received his place on the course at 18 I think? Correct me if I'm wrong anyone..
What BA look for is your leadership, teamwork and problem solving skills, and they look for candidates who will one day be a captain in their fleet. You may already have good experiences you can refer to in the interview and application process, the key is to be able to present these and relate them to the situation they are putting you in.
Keep faith and confidence in yourself, if you go in with doubts they'll see through you.
(I'm on this year's FPP starting this week)
Best of luck in your application