I can't believe how wound up some people are getting over this very trivial issue.
It's really quite simple to understand: CA wanted to cover a 500 year historical period in 250 turns, to give gamers the opportunity to play with different generations of combat units in a reasonable period of time. That meant one turn every two years. But one turn every two years means generals only get an active lifetime of about 30 turns, which is very little time to develop them. So they abstracted the aging rate of generals to one year every two turns, to give them an active "lifetime" of about 60 turns.
There are already a number of time abstractions in TW, some of them much worse than this one. For example, how realistic was it in MTW/RTW that your army could only march one province per year? What about sieges? Do you really think it takes a year to build a battering ram?
But if you really can't bear this latest abstraction which is very modest by comparison, then as others have pointed out, it's easy enough to mod it.
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