Not true. If you read, then parse, you will note I cited some who are contemporaries of mine, possibly yours, and, I've still got a couple of years before I reach the century mark.All your other examples are from 100 years ago.
The older cites are because no era or range of years was specified in his observation. The observation was posed so that it actually covered any politician who served in combat. And, there are many more than I cited or that you or I know of. The observation I cited didn't even restrict it to US politicians. I did make that assumption though.