Different Experiences different folks?

I moved to DC 4 years ago to a neighborhood where I didn't know a single person. Now Ican go out multiple times a week, see someone when I leave the house that I know, know names of many kids, can have a party with like 40 people come over with 2 days notice.. etc, been to at least 25 other people's houses for parties, hangs etc... (I am 40+ and have two small kids btw). I'm having my best time since living in college, probably.

When I moved to the area out of college 20+ years ago. I really didnt think folks were friendly and outgoing (outside of maybe kickball leagues and getting your right group apartment), didn't seem that easy to make friends. Didn't say hi to random people.

Has anyone noticed this change between your early 20s and your late 30s/40s?

Is this diff a change in culture, a different neighborhood, or am I'm just the right neighborhood for social parents?