Unless you live in a tropical climate, you are going to need time to acclimatise. Most people do this fairly quickly and enjoy our trips. Some people never fully acclimatise and find that our easiest trips are much harder than they expected. Everyone benefits from a bit of acclimatisation. For most people, the older you are, the more time you should allow yourself in the tropics before beginning the walk.
Fortunately, there is no need to exert yourself to the same extent as you would in a colder climate. Packs are lighter. Beautiful swimming pools are plentiful. Why rush? Relax and enjoy it.