Entrepreneurial spirit

Today I was chatting with my American friend. He is 80 years old and an ex-pilot. Thing is, he is more entrepreneurial and positive about the future than I am, at almost half his age. He is moving and renewing his business, and is planning to start up other businesses as well. But the most impressive is, he says he wants to start flying again, as a pilot. At age 80. I don't know if they would let him, but his attitude makes him deserve it.