Age in new Monsters

[Uh-Nu-Buh]

I've tried a number of combos like:
#startage 20
#maxage 100
or
#startage 50
#maxage 100
or
#startage 200
#maxage 1000

and every unit starts with old age like:
age 2
oldage 2

This means they age very rapidly and over the next 24 turns they accumulate handicaps and die.

How can I get this age thing to work? Should I be doing this in turns instead of years--

#startage <12*20>
#maxage <12*100>

Thanks!