Actually, I was working at my 3rd job, the first having lasted a week. The second (better paying) lasted three months. The 3rd (better paying again) lasted 5 years until 1975. Next month I retire from my 5th job.
I saw my first handheld calculator in 1973. An HP35 for $400.00. Time moves on...
I didn't care for RPN, so I bought a TI scientific calculator about the time the HP-35 came out. It finally quit working, and I donated it to the Engineers Club of Dayton for their museum.