Gee, I had my first one at 45 years old... I always paid cash, and didn't seem to need a credit card. One day a lady at a Canadian Tire store offered me one, so I filled out the papers and now I have one. It's useful to buy things on the net, and when taking a trip.
It's so easy to spend with a credit card, especially when so many things are missing.
How did you cope with your first credit card? Did you start spending too much?