What I was going to post based on your original report of retiring in 1988 with $3M (keeping it for illustrative purposes):
He must have sold the stock when he retired to buy that house and those cars. Had he kept it in XOM, his $3 million would have been worth $22 million today, with a dividend that would have covered his expenses and that kept pace with inflation.
Not that keeping your nest egg in a single stock would have been advisable, but the S&P return for that would have been comparable.