This is a wonderfull trail, with great views. The trail is easy to follow, challenging, and features some steep climbs and descents, but the canyons, caves, and natural rock amphitheaters make it all worth the effort!
If you exercise regularly, it probably won’t be a big deal. If you don’t, just plan to stop and catch your breath every now and then. I think most adults could complete this hike and still be happy at the end.