Which tabletop role-playing game was first published in 1974?

In the mid 1990s my son would invite friends over to the house to play D&D. I enjoyed watching them play but had no desire to play myself. Flash forward several years. My son AND daughter-in-law call and say, "Dad, get on your computer and we'll show you a really neat game." It was DDO. I've had my own guild ever since.

never played it, it's more American based game

I started playing in 1973, now both my sons play!

I've been crazy but it's fun detective up and did

Used to play often. Great fun!

never got into that game!!