Well Kim, 40 years ago in which state? LOL!!

It may have been one set of rules in Illinois, and a completely different set of rules in say Iowa. . . might be something you could track down at local library. .
As I recall, the voting age was 21 up until before the 1972 election, when it was lowered to 18. . . and I think the draft age has been 18 for quite a while, but I'm not sure on that.
I do know for a fact up until the early 1980's, there was no set national age limit on alcohol; in some states you could drink at 18, some at 19, and some you had to be 21.
And actually, there really isn't a formal, national age limit even now- technically, a state could drop the drinking age to 18 any time they wanted to. . . but, there's a good reason they don't.
Back in the early '80s when the the Federal government decided that there should be a uniform drinking age limit of 21, I remember Louisiana said they were keeping thier's at 18, and the Federal government didn't have the constituional powers to make them comply.
But. . . what the government
did have the power to do was cut off all federal highway funding to any state that didn't comply, and Louisiana decided that maybe upping the legal drinking age to 21 wasn't such a bad idea after all. .
