Most important is that everything is canon. Sometimes a campaign fizzles out. Still canon. The end of that adventure is free for the next DM to write out as they wish. Often these campaigns are considered to have had the party fail their quest.
I have had to add a magical plant, which when processed, slows the aging process. I felt a bit harsh killing retired characters, so the rich and powerful tend to not age too much. Some players are fine with their characters to die off, but thats there choice.
Lastly we sometimes dust off old characters to deal with major problems or just for mainly RP type sessions.
It requires some investment to keep it up but it is really nice to meet ppl on a regular basis for other things than food or alcohol.
I think streamlined vs complexity is a topic that should be discussed here. Complexity isn't a bad thing- Street Fighter is more complex than Mario 1. But that doesn't mean it's bad, obviously. PF2e vs D&D5e are similar. Both are great games depending on what sort of complexity you're looking for, and that's personal taste. For me, 5e isn't complex enough.
Combat is a lot more interesting, its not just roll d20's burning down the HP of whatever you fighting. I tend to find that 5e battles seem very same-ish.
As a player, I think it has a higher learning curve because of the new action rules and the vast amount of actions one can do, but personally I think it's a good thing :)