I'm pushing 40 and recently got back into playing baseball with my friends, like an idiot. Currently I am nursing a pulled left quad muscle, 3 or 4 bruised ribs, and a sprained right index finger.
You don't have to if you don't want to. Subscribe to the one you like best, and help grow that one.
Personally, I find myself only subscribing to and browsing communities on the local instance. The idea of the Fediverse is cool and all, but it's just way too much information for one person to process.
As much as I'd like to be able to see subreddits on the fediverse, I'd be more worried spez having influence than zuck (threads).