Rounds and Aging

I play each family for 1 round. A round consists of 2 years and each family is played for 1 season during those 2 years so each round, my sims get 2 years older.

The age stages are as follows:

Babies: 0-1 year
Toddlers: 1-3 years
Children: 4-11 years
Teens: 12-17 years

When a sim turns 18 they'll either go to college or age to adult. They will be 18-21 during this time.

Adults are ages 22-50.

A sim becomes an elder at age 51 (I may tweak this a little yet since 51 seems quite young to be classed as an elder!).