I hope they'll differentiate by more than they do now - which is by appearance and by who gets attracted to venues (more YAs at nightclubs, more Adults at bars). I also like being able to limit a club to younger adults or older but not elder adults. Speaking as an Adult, I do like that there's an appearance shift partway between not-Teen-anymore and Elder. Not keen on the Sims 3 "midlife crisis" back, but I could live with it if I could cheat it away for individuals where it makes no sense to in my headcanon. Not really sure what else would make for meaningful new differentiating gameplay. Lower fertility chances, maybe?