Am I Being Unreasonable? Original Owner Wants Car Back

If y'all want to disagree with me, that's fine, but please elaborate why, as my reply clearly straddles the fence.
I didn't RedEx you, but I'm guessing it's because of your assertion about buyers dying off and now being peak selling time. I've heard that story regarding different eras of cars over the years, but haven't seen it happen. Have you priced a '30s Ford or Tri-Five Chevrolet lately? My Dad's first car was a '55 Chevy. He'd be 87 if still around, yet those cars are more expensive than ever, even adjusting for inflation. Personally, I wouldn't give a plug nickel for one, but there's still a ton of enthusiasm. I think prices are upswinging in general as a market trend, but it has nothing to do with mortality. Stocks go low, cars go up as investments. Prices have soared and sunk multiple times since I've been playing with 'em.

If average lifespans are of any significance, I've got about 25 years left in me--fingers crossed. There are hoardes of people 10+ years my junior who are very into musclecars in general (my 19-year-old employee drives a '68 AMX 290/4-speed). The median age of people I see at swap meets doesn't seem any higher, either. I see lots of people well under 40, and they're not looking for import parts.