I am 65 and also have POTS. After some scary moments I now use a scooter for all things cruising and airports. Lines pose no problem now. Long pier, port shopping, excursions? No problem. I have a nice folding travel one that I can fold in less than a minute so that I can still enjoy all the ports, whether tendered or not. I snorkel, and even zipline if there is an elevator to get to the launch. Can I do everything? No. You have to know your limitations. I am sure that some people are confused when they see me be able to get off and walk around, looking perfectly fine, but I don't let that bother me. I'm glad I can do that - but I still need it to prevent a seriously high heart rate leading to collapse. Time and distance is my enemy - oh, heat too. POTS is no joke - and it's totally invisible to others. Same with so many other invisible challenges/illnesses people face.