[Jack O'All Trades]

My intuition is that whatever Traveller-y life path system you develop, it would work best with TFT if the standard procedure is to spit them out and play them as PCs at whatever point they get to 32 attributes, rather than at a set age. You might end up with young up and coming heroes mixed in with older late bloomers, which seems to fit with how 'naturally grown' PC parties tend to look (that is, what players come up with on their own) and gives more diverse life stories and perspectives.

You'd probably want to let them fill out any 'missing' talent points, too, and generally aim for an expected 3-4 talent points to be missing, so that any character can become a new fighter or pick up some social skills that aren't too tied to professions/life history per se.

Of course you could probably use the same setup to develop more experienced characters, but I think most players like the 32-34 pt period enough to play it out rather than incentivize maxing out the life path game (as a lot of Traveller players end up doing - it works within the very different system + setting, I don't think it would be as fun in TFT).