I remember a hike not too long ago where I was coming down a popular trail, passing hordes of day hikers on their way uphill. What made me laugh was that the "serious" hikers, the ones with at least backpacks and water, were mostly retirement age or older. The younger crowd was busy peeling their shirts off, stopping on the side of the trail, and trying to grab some cool air. The older folks were flying right by them, sipping water and happily talking & enjoying the hike.