By the numbers: The oldest Senators are the following:
Sen. Chuck Grassley (R-Ia.), 90
Sen. Bernie Sanders (I-Vt.), 82
Senate Minority Leader Mitch McConnell (R-Ky.), 81
Sen. Jim Risch (R-Idaho), 80
Sen. Ben Cardin (D-Md.), 79
Sen. Angus King (I-Maine), 79
Senate Majority Whip Dick Durbin (D-Ill.), 78
Sen. Richard Blumenthal (D-Conn.), 77
Sen. Ed Markey (D-Mass.), 77
Sen. Tom Carper (D-Del.), 76
Sen. Jeanne Shaheen (D-N.H.), 76
Sen. Mitt Romney (R-Utah), 76
Sen. Peter Welch (D-Vt.), 76
Sen. Joe Manchin (D-W. Va.), 76
Sen. Mazie Hirono (D-Hawaii), 75
Zoom out: There are 68 senators age 60 and older — that's more than half of the Senate.
https://www.axios.com/2023/09/29/feinstein-dies-oldest-senators-mcconnell