Travel when we are still young

Few days ago, I was chatting with a friend and we talked about travelling. When she named the many places she had visited such as New Zealand, Australia, the USA, Italy, Spain, Africa and so on, I curiously asked her why she did not visit any South East Asia countries and our local towns. She explained that we should visit the farther countries when we are still young and reserve some nearer ones for our old age due to the following reasons :

1. Age permits - At a younger age, we can walk faster, cover greater distances and travel longer hours, even put up with tough situations without much problem.

2. Health permits - If we ever fall sick on a trip, our younger body will usually recover sooner. We are physically more adaptable to weather or climate changes, time difference(quicker recovery from jet lag!), different food and eating habit etc.

3. Financial status - Normally, from 30 to 50 years of age are considered our most productive years in life. We can make more than enough money for a living and thus can afford to spend more on travelling. We can even afford luxurious trips with extra earned from overtime work or a part-time job.

4. Our older age - when we reach certain age, our health will not be as good as our younger time. We can then choose to travel to nearer countries or make short local trips. The schedule and itinerary of such a trip may not be as tight and jam-packed as a package tour to Europe. We may only have to take short-distance direct flights to our destinations, and food and weatherwise will most likely be quite similar to our own as well.

Sounds reasonable, right? I've been to a number of countries both in the Southern and Northern hemispheres and I think my friend is right in a way, what do you think?