Hello, welcome to the forum and, congratulations on your upcoming marriage!
I was single 14 years and stubbornly independent --- not an admirable trait in women of my generation - lol lol lol Point being, be very patient with your new roommate. 12 years by yourself is going to make even the smallest and most simple "intrusions" become an annoyance. We have been married 8 years and I still get annoyed but, most things aren't worth crowing about - lol lol
However, we do maintain separate TV's as we absolutely do not agree on what to watch and neither of us will concede - lol lol lol
Mr. TWH Rider still works because he is Hypertensive Type A and also wants to collect the max on his S.S. I retired at 64 because of some health issues that were keeping me from getting to work on time. I still have four horses to keep me busy; mukking stalls, getting them ready for turnout, then getting ready to be at work by 9:00 AM was starting to take a toll. Since the horses aren't going anywhere until it's time to send them to their ancestors, the part time job did - lol
If you can't get your brain to slow down to full retirement, you might consider a part time job either in your field of expertise or something totally different that you always thought you might like to try.
Volunteer work could take up some time, as well.
Maybe a sport that you never had time for, that won't kill you; that means NO football - lol
If you're a longtimer in your community, maybe even the headaches of running for a local government office.
There's plenty of options, just have to sit back and think outside the box, once you say your "I Do's"
What part of CA? I lived in SoCal five years, which is where I met my husband. We didn't get married until we reached Tennessee. I said if we didn't kill each other on the move (two Ryder trucks, him pulling the ancient Cheby, me pulling my horses, plus three dogs and a cat), then I'd marry him. We didn't, so I made good on my word - lol lol lol