It depends.
I’m in my mid-40s and when out with my friends we tend to start earlier, so 3-4pm.
Some nights that means we’re home for 10pm. If it’s a “bigger” night, midnight.
I was on a hen a few weeks ago that was out until 2am.
Back in the day (my 20s) it could occasionally be 5-7am on a weekend, but that was following a later start.