Trivia - Mother's First Election
My mother married in 1920 at age 16. She had a September birthday. That was the same year that women in the US got the right to vote. However, Mom did not get to vote in the next presidential election in 1924 because she was only 20 yr old; The voting age at that time was 21. Mother had to wait until 1928 before she could vote for a president. She had been married for 8 years at her first presidential election in which she could participate.
The voting age was lowered to 18 in 1971. The argument to support this lowered age was: If they are old enough to go to war, they are old enough to vote.