This is the fuzziest part of my human experience. Why do I like X and not Y? Why do some people like hot peppers and other people do not?
When we are children, we don't have much innate fear. We don't fear falling down too much, but we can learn to fear it if we get hurt. As a kid, you can learn how to fall down without getting hurt; your head isn't so far off the ground, your bones are not brittle yet. As an adult if you fear falling down, you will almost certainly hurt yourself when you fall. If you didn't go down that path as a kid, you may never take up skiing, or mountain biking, or other sports.
When we are children, we don't have much innate fear. We don't fear falling down too much, but we can learn to fear it if we get hurt. As a kid, you can learn how to fall down without getting hurt; your head isn't so far off the ground, your bones are not brittle yet. As an adult if you fear falling down, you will almost certainly hurt yourself when you fall. If you didn't go down that path as a kid, you may never take up skiing, or mountain biking, or other sports.