You probably noticed it at some point. A cut that would have been gone in three days takes a week. Muscle soreness after a workout lingers longer than it used to. A cold that you would have shaken off in 48 hours drags on for ten days.
You chalked it up to getting older. And you weren’t wrong — but that explanation stops short of what’s actually happening.
Healing is not a passive process. It’s an active, coordinated sequence of cellular events that requires precise communication between cells, efficient energy production, and a well-functioning immune response. When all of those systems are working at full capacity, healing happens quickly. When they’re not, it slows down.
Here’s the sequence that happens when you injure yourself:
First, your immune system sends signals to the site of the injury. Specialized cells rush in to clean up damaged tissue and begin the repair process. Then your body lays down new tissue, rebuilding what was damaged. Finally, the new tissue matures and strengthens.
Every step of that process depends on clear cellular signaling. The immune cells need to receive the right signals to know where to go and what to do. The repair cells need activation signals to begin building new tissue. The antioxidants that protect the healing tissue from further damage need to be activated by redox signaling molecules.
When redox signaling molecule production declines — as it does steadily after your mid-20s — every step of that process slows down. The signals are still being sent, but they’re getting through less reliably. The result is exactly what most people experience: slower recovery, longer healing times, a body that just doesn’t bounce back the way it used to.
This isn’t inevitable. It’s a biological mechanism with a biological explanation. And biological mechanisms can be supported.
I do physical work. I machine metal parts, I lift, I push my body regularly. At 61, my recovery is something people comment on. Not because I have exceptional genetics — but because I’ve spent 15 years paying attention to what actually drives recovery at the cellular level, and doing something about it.
Slower healing is not just an inconvenience. It’s a signal. Your body is telling you something about what’s happening at the cellular level. The question is whether you pay attention to that signal or just wait for it to get louder.