Traveling is simply easier when you're young. For example, have you ever wanted to climb Mt. Everest? Guess what, it's going to be a lot easier in your 20s than 60s.
Put it another way, the set of all places you can visit while young is simply bigger than when you're old. Places that require intense physical exertion will be off limits to you.
Put it another way, the set of all places you can visit while young is simply bigger than when you're old. Places that require intense physical exertion will be off limits to you.