Maybe it's the 2am wake-up, staring at the ceiling, wondering why sleep stopped being automatic.
Maybe it's the knee, the back, the hip that complains now in a way it didn't five years ago.
Maybe it's hormones that quietly stopped following any pattern you recognize.
Maybe it's the small hesitation before the hike, the dance floor, the game of tag with the kids or grandkids - not "I don't want to," but "I'm not sure I can."
These aren't separate problems. They're what happens when the terrain your body depends on gets depleted - and it's exactly what this afternoon is built around.