It may be inappropriate but if Utah’s Governor was Democrat he/she could appoint someone to finish out the term thereby giving an incumbent the upper hand. Something to think about. There could be 25 70+ year-olds in the senate. That’s too many.
Same as SCOTUS
Bennett was ousted in 2010.
Mike Lee has his old Senate seat.
Looks like there are currently 6 senators over the age of 80 (5 or which are Republicans), and a further 18 over age 70 (8 Dem, 8 GOP, and 2 “independent”).