Went for my CX final interview recently - this is for SO.
Out of the 15 guys there only two were not currently flying jets. 3 Were 747 co pilots. one MD11. Quite a few on 737, RJ, Fokker etc. The prop guys were on Dash 8. So to underline what was said above - its a long way and you planning too much too soon. That said though there is opportunity everywhere - good luck. I only started my comm at 26 and was in a jet less than three years later - due to HARD work and some luck - and you will be too cause at 29 you have the commitment and maturity the 23 year olds dont have!