Wow! I admire people who can stick at a lot of generations.
In TS2, I completed 10 generations in the Apocalypse Challenge - that was so darn difficult! But so much fun, especially at the beginning when it was really hard.
In TS3, I completed 8 generations, but I found it hard to keep up with everyone and they had so many relations spread out it was like Sunset Valley was just filled with my one family!
In TS4, I started my first legacy challenge on 25th Dec, so it is not very old yet. My founder is still a YA (normal lifespan) now with 2 kids, but they have already gone from having a tent and a pee bush on an empty Lot to having a 3 bedroom detached house! I imagine they are gonna be hugely rich before long.