What is For most of the 1900s the legal voting age was?

For most of the 1900s, the legal voting age in the United States was 21 years old. This standard was established by various state laws and was reinforced by the 26th Amendment, ratified in 1971, which lowered the voting age to 18. The change reflected growing recognition of the rights of younger citizens, particularly in light of their participation in military service during the Vietnam War. Since then, 18 has been the minimum voting age across the country.