Here is the one I use. It has one flaw in that sometimes it doesn't change the age when it is the recalculation time and I have to reput the year in but it works fairly well except for that. If you don't want the years old at the end you can just leave off the &" "& "Years Old".
Year (DOB) -
Get(CurrentDate) < Date(Month(DOB); Day(DOB); Year(Get(CurrentDate)));
Any calculation field that includes get ( CurrentDate ) -- and most age calcluations do--must be setup as an unstored calclulation or they will not update each day with the new date from your computer's system clock.
Thank you. I forgot about this. :)