Same thing here:
It's not easy when you're being passed up by younger or fitter hikers. When I was creeping down the descent into Port Clinton today a young hiking machine skipped past us and it was totally demoralizing. Demoralizing because you can't get your youth back. Demoralizing because you know your weight is causing unnecessary stress on your feet, joints, and muscles. Demoralizing because as much as you know not to run other people's races in your head, you still do a bit, wanting to be those guys who clock 20 to 30 miles a day.
Let us review who you really are.
You got your ass out of your house and your comfort zone, you got on a plane and shot yourselves across the country, got OUT there and you are DOING it. I'm sure it feels crappy to compare yourself to younger folks. Stop it. Compare yourself to the you that was sitting his ass at home, set a goal, made it happen, who is now hiking the Appalachian Trail with his lady.
If it's any consolation to you at all, these meds they put me on for my flippy heart won't let my heart rate go high when I'm in AFIB. What that also means, is I couldn't climb steep stairs at Universal Orlando to get on the Hogwarts Express without feeling like my heart was going to straight up explode. I had to use ***the elevator*** the second time around. Talk about humbling. I wasn't like this AT ALL before the meds. Last year this time I was running my driveway (!) and tread milling my butt off. I freaking hate this. This isn't me. This is me being treated for a heart arrhythmia because if left untreated, it increases one's risk for stroke 5x's.
I have no choice but to accept it right now. And I'm not the only one. Folks of all ages have it. Football players have it. Celebrities have it. I can't go steeply uphill, but I can by God go pretty fast on a level surface and do some incline, because eff this stupid crap.

So don't beat yourself up. I am so much enjoying your travelogue and photos. Be happy for what you can do, for where you are in the world, and that you and Mrs. Cam can do it together. It's an experience of a lifetime! Come on, you're going to the Promised Land--Jersey!

There's a snack size lady out here in CO taking her meds, fighting BS AFIB like it's her job, and so excited to hear about your travels. All of us are. I was tempted to mention what you're doing up in Terrestrial, but I thought better of it because then a bunch of fly-by-nights would show up and contaminate the thread with lip service. The folks who are tuning in down here are truly interested and inspired. Look what you did to Xeno!
Keep moving, buddy. You amaze the crap out of me.