Seems like a common theme of every veteran to dress the way used to in their prime for the rest of their lives, listen to the same music, watch the same movies, etc. and to use the same belief systems as well. On the one hand, if it worked for them, why not? There's no incentive to change. Heck, it is very much the definition of conservatism. Old men who don't change is so common that it borders on proverbial.

Very rarely, however, do you see a brilliant mind like Richard Feynman, a man who was so open to new ideas and out of the box thinking. Even in old age. Seeing someone, in good faith, question what they believe in light of new knowledge is very rare. Now that is a special thing.