https://www.americanthinker.com/articles/2020/08/the_democratic_elite_is_aging_becoming_demented.html

The Democratic Elite Is Aging, Becoming Demented

... Why won't the media look at all current members of the U.S. House of Representatives and break them down by age category and party affiliation?  Because they would see that Democratic members are older and longer serving than Republican ones.  There are 56 Democrats and 22 Republicans currently serving in the House who are now older than 70 (2.5 to 1).

The data also reveal that older Democrats occupy their offices for longer terms than their Republican counterparts: Representatives who are 70-plus years old have 22 Democratic members who spent less than 20 years in office and 34 of them who spent between 20 and 39 years in office.  For the Republicans, these numbers are 17 with less than 20 and 5 with 20 or more years in office.