At Least I'm Not as Old as He Is

I spent the afternoon with the friend who likes going to flea markets, thrift stores, and elegant-junk stores.  I bought a New Mexico trivet (which will fit well with my "cheap New Mexican" office decor), and he mentioned that he had visited Carlsbad Caverns in 1969. When we went to the fair a few weeks ago, he said that he hadn't been on the skyride for 45 years.  (Man, he was a busy kid that year!)

What I want to know is, when did I reach the age that I have friends who can remember farther back than I've been alive?