Changing your mind about important matters.

We are the product of the sum of our experiences.  The longer that we are alive, the more experiences we collect.  At one point or another, younger people begin noticing that they have a different viewpoint than do their older neighbors.  Older people tend to resist changing their attitude about things, even as conditions begin to change around them.  The trick to life for older people is deciding intelligently which opinions need to change and which should remain unchanged.  In order to do that intelligently, the older person needs to understand the changes that technology is introducing.  I find it to be an interesting challenge.