Is there a way to stop your general aging?

I thought this would've been asked before but didnt find a 'DIY: Immortality' with search. So. Anyone know how to make generals stop aging, or make them not to die of old age?

I think something like making them 300 years old or -1 years old might avoid the games aging checks. But i havent tested anything yet. Just got into this modding business and have a bit trouble getting everything figured out and working yet. I quess immortality shouldn't be the first of my worries :)

I wanted to make my starting leader immortal, so making a trait that reduces age and triggers when certain named leader reaches certain age, would work too. Atleast for my purposes. Anyone know if this is possible?