From “Today in Florida History” on Jacksonville.com, a blog of The Florida Times-Union:
Nov. 2nd, 1948
Johnnie Wright of DeFuniak Springs was elected to the Florida State Sentate on this date. Wright, age 23 years and 7 months, was one of two members of the Senate at this young age. The other state senator, D. J. O’Grady of Inverness, was 23 years and 3 months old when he was elected in 1967.
The youngest State Senator ever elected anywhere, as far as we could find, was John A. Hastings of Ohio. He was 22.