Why not simply reduce the season lenght? Seems strange that suddenly you age at 4x the rate.[/quote]
…because the minimum season length is 17 days, if i recall correctly[/quote]
Oops :D[/quote]
14 days when last I played: one day in DDA ~= one week IRL. Quite a lot of crafting/construction was compressed to that ratio. In general, it helps if the player can accomplish enough of $REALLY_LONG_PROJECT in a game day that xe can step back, check over the work, and think “yeah, I made progress today.”
So though you can expand season lengths to 1:1 DDA/IRL time, that makes the PC extremely fast. 
As for the merits of aging: Yeah, I’m thinking trait/mutation at best. IME some chars last into year 2; not that many make it into 3. So I’ll suggest that starting young or old might be neat (metabolism, sleep, healing, maybe stat effects) but I’m not sold on having in-game aging, even with mutations.
(Edited: thing->think, fix grammar)