Age and Politics

I recently looked at the demographics of Congress. Here is what I found:

0 Senators age 30-39
15 Senators age 40-49
30 Senators age 50-59
32 Senators age 60-69
23 Senators age 70 and over

1 Representative age 25-29
17 Representatives age 30-39
92 Representatives age 40-49
177 Representatives age 50-59
121 Representatives age 60-69
31 Representatives age 70 and over

That is, no one in the Senate and only 4% of the House is under 40 years old, even though about half the country is that old or younger. Meanwhile, 55% of the Senate and 35% of the House is over 60 years old.

Is the Congress where politicians go to retire?!?