I may be reading this completely wrong but this makes me think of a possible mechanism of aging..
At the beginning of our lives there are processes that are turned on that signal for us to grow from babies to adults. Very abruptly these processes stop when we are able to reproduce or just after. But the stopping of these processes is never complete because tissues still need to be repaired, things physically still need to adapt. So now you have some subset of the original growth processes turned off (thus not causing adults to keep growing) but also have some subset that don't turn off. This combination of growth processes that are on and off causes "growth" without the macro growth of the adult but this causes aging.
At the beginning of our lives there are processes that are turned on that signal for us to grow from babies to adults. Very abruptly these processes stop when we are able to reproduce or just after. But the stopping of these processes is never complete because tissues still need to be repaired, things physically still need to adapt. So now you have some subset of the original growth processes turned off (thus not causing adults to keep growing) but also have some subset that don't turn off. This combination of growth processes that are on and off causes "growth" without the macro growth of the adult but this causes aging.
Idk just a shower thought