Is there such a thing as a residential community for younger people?

I was researching senior homes and I'm a few minutes into watching Man on the Inside Right now and I'd love to live in a place that feeds me, has community activities, and amenities like a theater. I've Googled this as at best there are "luxury" apartments with stuff like fire pits and Peleton bikes or something, but no "community". But I want an actual community. Does anything like this exist that isn't a retirement home?

Edit: not the military or college. Also younger meaning not a senior citizen.