Not quite the same, but I went back to do a theoretical comp sci MSc though I was running my own business, and now, ~30Y later, I'm back doing a PhD in a differ

Not quite the same, but I went back to do a theoretical comp sci MSc though I was running my own business, and now, ~30Y later, I'm back doing a PhD in a different field. The MSc was worthwhile, and the PhD seems to be so far.