I was switching between different Spreadsheets picking up formulae, here and there, and as I had 4 open I decided to simplify my Desktop and closed the wrong one, deciding not to save the changes, as I didn't think I'd made any!
I got stuck on trying to record peoples age, using their DOB and Today's Date. That worked, but I have only managed to get it as a round number. Even when the Column if Formatted to 2 places of Decimals. e.g. I get 62 or 62.00 but not 62.42