Once you hit ~25 or thereabouts, the cells in your body replicate slower and continue to slow down as you age. The process of “healing” is just replacing damaged cells with new ones. Since that doesn’t happen as quickly as you age, the whole process takes longer. So unless you can find a way to make your body grow cells faster, that’s how it’s gonna be.
Each cell needs a manual (DNA) to figure out what to do. When a cell divides, it puts the manual in a special printer that eats the manual and spits out two copies. A copy can only be as good as the original but the quality will wear out over time. There’s some margin added to the edges of the manual (telomeres) to help protect against it but that will only last so long.
When the copy quality is too poor, the cell is forced to be recycled. As you get older, dividing cells with older DNA have a higher chance of producing bad copies. It takes longer to produce good cells so healing and other bodily functions restore slower with age.
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