[Xietor]

well,

when they get afflictions and die 5 turns after you buy them, it affects my mood! But with some races like Ulm, their mages are so cheap, and with only a few getting old and dying, it is just more aggravating and micromanagement than balance.

I think the effect on balance would be marginal if no race had the old units. Except of course the races in MA that have no age issues like Pangaea, van, and Ryleh.