51.
When I started reading the thread I thought I'd be the oldest but, damn, there are a few that beat me.
On the other hand, my first computer game was back in 1975 - trek played on a mainframe using a teletype machine. No screen, just a keyboard and printer. You typed a command, the printer told you a Klingon vessel appeared at long range (yes, printed on a roll of computer paper), you typed in a fire command (phasers or photon torpedoes), hit enter and it told you the result. Repeat. Those were the days.
When I first saw Elite on a BBC micro in the mid eighties, I thought I'd died and gone to heaven. Then Civ I came along and I thought Catherine Deneuve had joined me there. Doom made me think she'd invited me to supper and given the servants the night off.
Heavens, I just googled teletype and trek and found this link - the source code in Basic for trek:
trek source code