Being a father at a later age is different from when I had my other two daughters when I was in my 20s and 30s. If you're in your 60s and you're with the kid every day you're dealing with the mind of a child so it opens up that childishness in you again.
Those people who develop the ability to continuously acquire new and better forms of knowledge that they can apply to their work and to their lives will be the movers and shakers in our society for the indefinite future.