[Endoperez]

There already is a combat spell that ages the target. It's called "Decay".

There is a way to disable aging. It's quite simple, too. It just requires a script to make, as otherwise it'd take quite some time.

#selectmonster 1
#maxage 10000
#end

#selectmonster 2
#maxage 10000
#end

#selectmonster 3
#maxage 10000
#end

#selectmonster 4
#maxage 10000
#end