Cliff, it's all been said already, however, given the majority of growth is in the Emirates and Asia you would not qualify at you age as the " experience commensurate with age" clause creeps in. At Qatar, you can apply as an FO up to 45 yrs old, but you would need 2000hrs, which means you would need to get a move on! Regional TPs are probably your best target.
The road from where you are to where you want to be is tough One issue is the study, if you can "Gel" with guys half your age it helps, however, dont expect to progress at the same rate, they don't have the baggage you do so don't beat yourself up if you drop behind a bit.
There are still some HR managers you can actually talk to in this industry, they don't have an axe to grind so will tell it as it is.
Reality is "we all regret the things we didn't do"
Best of luck