I guess no one knows for sure, but assuming errors accumulate after each cell division it'd make a lot of sense if, after some number of them, cell turnover slo

I guess no one knows for sure, but assuming errors accumulate after each cell division it'd make a lot of sense if, after some number of them, cell turnover slows and stops in order to avoid any further replication. In that case your plan would be treating the symptom, not the cause (accumulated genetic errors and whatever other junk in the stem cells). I would also expect it to lead to cancer.