Wow! 9 generations is a lot!!! I never got that far, although many of my families are the same I started with back in 2014.
I play rotation, and I play all houses in all worlds, so it takes me about a month to play them all 1 simday. I ajge everyone up one year when a round is completed, so it averagely takes me a full human year to age everyone up 10-12 sim years. In other words, the babies born back in 2014 are now about 55 years old. Those I created as adults have passed (except a handful elders who are still around. I must have 4th generation born in some families, but mostly just 3 gens.