People near us are still getting it. Our chiropractor and his family had it about a month ago, catching it right as they went on vacation in Central America. The wife was miserable the entire trip. Our chiropractor ended up losing 15lbs. No idea if any of them are vaccinated, but the assumption is they aren't.
Now, we just found out our next door neighbors (early 40s, two kids mid-late teens) are battling COVID. Husband had treatment for it, but still has a bit of respiratory symptoms. Oldest teen is already doing better. Wife and youngest teen are still testing negative. No idea if any of them are vaccinated, but the assumption is they aren't.
RE: figure I had COVID as early as late December 2019
The best way to find out is a blood test to see if you have the antibodies, otherwise it’s just speculation.