I think it is ironic that I didn’t like tomatoes when I was younger. Now, I’ll gladly eat a tomato like a piece of fruit (which I think it technically is). 
It gets me thinking about how we change as we get older. And become resistant to change. It is said that people don’t really change. Obviously, we’re not talking about what you like or don’t like. Nor does it refer to becoming “set in your ways.” I think the saying refers more to attitudes and values. And while I think this may be largely true, I don’t completely agree with the idea. 

Many people have had “life-changing experiences.” The life of Paul is a striking example. St Ignatius of Loyola is another. God works in mysterious and yet wonderful ways.