I've set the game to display years, not turns, so I think it would be easier to anchor things on that meter, rather than on character age. Most characters will age very slowly - in WotS, very few died of old age.

I know it's clunky - personally, I am trying to avoid talking about years at all. For things like governor build queues, I find it easier to anchor things by turns. For policy discussions in the Diet, I think it is useful to divide time into mid-terms (every 10 turns) and full terms (every 20 turns until we have a large Empire). However, we're controlling medieval nobles through an internet forum - some suspension of disbelief is required.