Younger people have an easier time adjusting to new situations because of less overall risk involved. By contrast, the older we get, the more resistance we have towards change. It’s because we’re usually comfortable with the current status quo and we often have more to lose by disrupting it.
The world is always changing. You either change with it or get left behind by pushing your old way of thinking. Not moving forward means stagnation – things that stagnate usually cease to exist.