The aging "system"

[DominionsFan]

I like the idea of aging btw, this is definitely gonna change the gameplay somewhat, especially if some strong units/SCs are dying, not "just" regular troops. Oh btw I have yet another question! How can this be balanced? Lets say unit A will have a much bigger lifespan, then then unit B. however overall the 2 unit's stats are the same. [attack,defense etc] Unit Awill cost more gems/gold/resource to recruit? I dont know what would be good. I mean the lifespan of unit A can be higher, but the stats of the units are the same.
I dont know how could this be balanced. There is a chance that the players will loose their units before they die - regardless of their lifespan, since this is a wargame afterall , but if they keep them to defend some provinces in safe positions, the player -who recruited units with a higher lifespan- will have an advantage for sure.

OR!!! maybe the units won't die just get some afflictions when they are too old? Nah I dont think so, this wouldnt make a sense. If aging is implented, the units should die after a period, no?