I moved out of NYC after the 2001 Al Qaeda attacks and back to my parents. There wasn't the same level of lockdown, and the 14 days I was stuck in SF when my 9/12 flight was canceled seems quaint now.
I used the change to learn python, improve my html & css skills, cook, and garden, all while consulting for my former employer. My parents were happy to come home to a meal every night and our relationship grew into friendship. My younger brother moved home a year later. Within a year, we had each found our "dream job" 90 minutes from home in opposite directions.
I left home fairly early and none of my school friends were still in town. The internet wasn't nearly as social as it is today. Going to see friends and doing freelance work in Brooklyn were the social highlights of the time.
In my neighborhood now, lots of younger people, many of color, are moving back in with their parents. In some cases, the parents have lost their jobs. The return to the nest is helping my community survive as these people are doing remote work or getting essential jobs and helping make ends meet. I am expecting foreclosures in the coming months, but these families are in a better position to weather it because of the returning income.
edit: In my mid-40s, I would move back in with my parents in a heartbeat. SARS-CoV-2, though, would likely hurt them more than me, so I'm staying clear.