And why not? Congress can choose to discard electors from states excluding candidates (as may happen next year).

“In the 19th century, several state legislatures elected senators in their late twenties despite the Constitutional minimum age of 30, such as Henry Clay, who was sworn into office at age 29, and John Henry Eaton, the youngest U.S. senator in history, who took his oath of office when he was 28 years, 4 months and 29 days old.”

https://en.m.wikipedia.org/wiki/List_of_youngest_members_of_...