Tokyo's oldest living man was actually more like the oldest undiscovered modern-age mummy: dead for about 30 years.
Now this couldn't happen to me: first this climate is too humid for meat staying fresh long (and my ceiling fans wouldn't suffice for making me into biltong), and furthermore my money would run out, my house would go back to the bank (but that's only for a few more years) and so the vultures would find me. Sky burial by bank clerk, anyone?
Sort-of bad: there aren't many other scenarios for me being discovered.