depends on what kind of a game I play
right now I am prefering something more relaxing, verging on nostalgic, and I am focusing on one family history since stylized as if in early 50-ties
so currently: epic (babies 7, toddlers 49, children 140, teens 196, YA 420, adults 420, elders 350)
with seasons set on 7 days each this gives me almost realistic life span when counted in years - about 56 years
also, they always have birthdays on the same day in a week and in the same season, as they were born (exception with becoming a toddler)
have been playing that for a while and the nostalgia factor, especially with all kinds of wheather on, definitely works
moreover, I immensely love the child stage, it is so much fun, I would like to make it last even longer
just one thing I DON´T like when playing epic: it should be a part of a base game, not story progression or whatever mod, that the rate of work / school advance should be automatically decreased when you wish to play longer life spans ... with epic lifespan to reach a top level of whatever 5 careers one after another would be ridiculously easy... my Sim became a Star News Anchor in 6 weeks without even bothering to do interviews