Mine just turned 5 about a month ago, but I'll chime in!
I picked other, because I really try to get in a bath every day, but sometimes we skip a day out of necessity. (We are living with relatives, there's 11 people in the house, so the kids who go to school and the adults who work typically get the shower priority.) When we are in our own place, to conserve water, I either bathe with one of the kids or alternate the two older ones every other night (unless one of them is in school).
Also, it depends on the time of year - if it's cold, and they just stay inside all day, then it's not such a big deal to skip. But if they are outside, they get all grubby, and since I co-sleep I don't want their grimy lil' paws in my bed.