As part of my 'rent' I could help out by entering numbers or verifying numbers for him. I discovered that his portfolio was worth more than $4M and I asked him why he was working at IBM if he was "rich". His answer was that he enjoyed working at IBM, you could just "spend" stock as you would lose out on future growth, and what would he do with his time if he wasn't working? The one conceit he admitted was that his house was paid for so he didn't have to pay a mortgage and that meant he had more disposable income every month.
That was a pretty amazing for me at that age.
The other random factoid was that for 10 years I was President of the "Home Brew Robotics Club" (which is still going on) and it was a direct outgrowth of the Home Brew Computer Club. It was started by Dick Prather as a "SIG" or Special Interest Group where HBCC members who were interested in using their computers with robots would meet and exchange ideas and such.