> How “old” is a single-celled organism? Good question, I looked around a bit for this, it seems the life of a single celled organism is taken to be from divis

> How “old” is a single-celled organism? Good question, I looked around a bit for this, it seems the life of a single celled organism is taken to be from division to the next division, but really this is a bit odd, because nothing died there. Clearly age for such organisms is not a well defined concept.