A friend of mine just told me she had a doc for years that was kinda cool. But something was off with him, she just couldn't point out what.
One day he told her, he's 80 years old and it hit her like a bus. Today, you usually don't interact with such old people in a professional manner anymore. Most people retire after 65 and many don't even live until 80.
He got some extra money from the government if he kept working in the village, because no docs want to work there anymore. Since he was fit, he did it.
This year he became 90 and finally retired.