Yes, the cells can be replaced. In old people, with their declining stem cell populations, that replacement will be slower and less effective. So give them lowe

Yes, the cells can be replaced. In old people, with their declining stem cell populations, that replacement will be slower and less effective. So give them lower doses over longer periods of time. Stem cell replacement is something that should be developed for use in old people anyway; the more of that going on the better.