[Edi]

That's an age discrepancy issue. The vaetti starts with age 22/50 and wolf has something like 3/12 or 15/30 at best. So when the Vaetti becoems a wolf, its old age lowers, but the actual age of the unit stays the same as the vaetti had because it's tied to the unique id number of that particular unit and not the monster type.

I suppose it would be fixed by having the Dominions world wolves be extra long-lived and having them be something like 3/30 or 3/50 and Vaetti age staying the same.