I've been playing Sims for the past 10 years. I've started many legacies, and I've finished none.

How do you stay motivated to finish? I usually get 5 generations in before I get super bored and move onto another family.

I used to have the same issues, ive been playing legacies for near enough the last ten years too - and only managed to finish one this year!

I think one big motivation is getting involved in the sims community - joining boards like this one, publishing your legacy, and having motivation from others! Another thing I used to do for motivation was to read other legacies - they always inspired me to make mine as good as theirs. :p