Answer:
Skin regeneration depends upon different cases -
Normal - In such cases , dead skin cells are replaced every minute by new skin cells which are again replaced by new cells when they die because each skin cells lifetime is not more than a minute .
Wounds - wounds take comparatively longer time since it kills off large number of skin cells and most of them pierce the upper layer or epidermis , where skin cells cannot form , which is why it takes longer time and scabs form to regenerate a proper epidermal base for the skin cells to regenerate and duration of healing differs upon the deepness of the wound .
[ As people age , repairing speed slows down and decelerates ]