Question

For most of the 1900s, the legal voting age was

Answer 1

The minimum age for voting in different countries were different:
1. In some countries like (most probably) France, prople had to have property to have the right to vote
2. In others it was 21
3. Some it were 18
And so on

Answer 2

in 1917 the voting age was reduced from 21to 18