Aging is, IMO, a campaign issue, not a system issue. It is also the primary reason I play elves in any campaign where aging could possibly be a concern.
I have played in few campaigns that even
need to address aging and my experience with aging as a rules system tends towards them all being anti-martial, pro-magic systems, which is just something I want to avoid including in any game at all.
I generally don't like to handwaive time. If time is passing with the characters "doing nothing" then why is there nothing to do? When there is nothing to do, parties tend to split up and when parties split up inevitably
someone (looks at the rogue with his 10-page character sheet) wants to micromanage their time and
someone (looks at the fighter playing on his cellphone) doesn't really give a doof. Castles could be built, families could be raised sure, but some players are happy to say "I use my money to buy a farm, find a nice woman, raise some kids, and do that for 10 years." While other people want to run every moment of their time as though it is real-world time. Whatever the case is, why, in that extended time period, are there no quests for them to undertake? Why are there no evil wizards rising in the east? Why are there no mighty dragons to slay?
I don't mind skipping a month here or there for travel or waiting for something important, but that's not really going to address
aging just character boredom.
But I have found very few people who actually find that
fun. And the aging component? It's STILL not a concern. Players who worry about getting taken advantage of via aging play elves or other immortals or nearly-immortals. Players who don't worry about it,
don't worry about it! Players who want to engage in it inevitably play wizards or warlocks or even clerics seeking powerful magic to keep them alive for eternity. But few players really do that, and fewer games cover the sorts of time periods for aging to even come into play.
So, really, I think aging is a nifty non-issue for the vast majority of games.