While 64 may be too old to embark upon a three-term Senate career, it wouldn’t stop Hill from running if he thought that he’d have a shot at winning.
Ellsworth would be the most Donnelly-like nominee, and could win if the GOP nominee messes up.
Ellsworth already ran in 2010 against Coats. Lost by 55-40%. He’ll be pushing 60 himself in 2017. Ex-Indy Mayor Bart Peterson is the same age as Ellsworth (turns 59 in 2017).
Hammond Mayor Tom McDermott, Jr. is the baby of the bunch (born in 1969), though he seems more interested in perhaps running for Governor (but he seems better positioned to run for Congress if and when Peter Visclosky decides to retire — he’ll break the record for longest House service from IN, 34 years+ in Jan 2019, currently jointly held by Lee Hamilton and a predecessor from the 1st, Ray Madden).