Your Age determines what you see.

Through a child's eye the World is a fun magical place. As they become a teenager they see the World as a great big place they can explore. In their twenties they see the World as a vast open land at their disposal. As their thirties roll around they see the World has rules that they must follow. And Oh lordy as they turn forty they realize the World is full of hills and mountains they must climb. By the time they hit those nifty fifties they see the World as a big open space they could get lost in. As the sixties sneak up on them the World seems to be going on without them. Once they hit their seventies the World has become hard to navigate through and they realize the World has changed.