I guess it depends on where you start counting the 'threes' - there was McCain, Ginsberg and now Feinstein. We could be done.
OR -- If we start with Feinstein, who knows, we have quite a few in their late 70's and 80's -- Feinstein was 90 so she makes the others look like spring chickens.
Biden - 80, Pelosi - 83, Trump - 77, McConnell - 81
There are quite a few DEMS that are 75+
https://fiscalnote.com/blog/how-old-118th-congress
Here’s a list of the oldest members of Congress:
1.
Senator Dianne Feinstein, Democrat of California, 90 (retiring)2. Senator Charles E. Grassley, Republican of Iowa, 89
3. Representative Grace F. Napolitano, Democrat of California, 86 (retiring)
4. Representative Bill Pascrell Jr., Democrat of New Jersey, 86
5. Delegate Eleanor Holmes Norton, Democrat of the District of Columbia, 86
6. Representative Harold Rogers, Republican of Kentucky, 85
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7. Representative Maxine Waters, Democrat of California, 85
8. Representative Steny H. Hoyer, Democrat of Maryland, 84
9. Representative Nancy Pelosi, Democrat of California, 83
10. Representative James E. Clyburn, Democrat of South Carolina, 83
11. Representative Danny K. Davis, Democrat of Illinois, 82
12. Senator Bernie Sanders, independent of Vermont, 82
13. Representative John Carter, Republican of Texas, 81
14. Senator Mitch McConnell, Republican of Kentucky, 81
15. Representative Frederica S. Wilson, Democrat of Florida, 80
16. Representative Anna G. Eshoo, Democrat of California, 80
17. Representative Kay Granger, Republican of Texas, 80
18. Representative Rosa DeLauro, Democrat of Connecticut, 80
19. Senator Jim Risch, Republican of Idaho, 80
20. Representative Virginia Foxx, Republican of North Carolina, 80