SS - I'm a couple of years older than you and still have the same problem with my old man and cars. "No - I'll drive, you go too fast!"
Strapped him (aged 76) into the front seat of the Pitts last month and took him S&L to Seething, about 6nm away. Just as we approached he said something that I took to mean, "Show me a roll!"
On the ground he admitted to being terrified but said he was quite pleased he'd done it. He did insist on being driven back!
Go figure!