How to Feel Old in One Easy Lesson:
Make many, many trips up to your son's sixth floor walk-up apartment in New York City carrying giant armloads of stuff after spending many hours buying giant armloads of stuff at Bed, Bath and Beyond.
Then spend many many hours putting together Ikea furniture - with lots and lots of parts and little wrenches and screws and weird visual-only instructions that nobody uses anyway.
Then spend many many hours carrying large armloads of cardboard (from the boxes that the Ikea furniture came in) down to the trash cans on the first floor (and of course, walk back up to that sixth floor apt).
I'm not sure which I burned more of: calories or cash.