I had a conversation at work this week with a few of my colleagues about how often we change out bedding. I and several of my friends say they should be changed once a week, once a fortnight at least. But a couple of my younger colleagues (I'm talking 28, so not teenagers!) said they change theirs every couple of months to every four or five months. Ditto their towels because "they are clean when they get out of the shower". Were we unreasonable to a) practically boak and b) tell them they're old enough to know better, in no uncertain terms? Should we have held our peace instead of hoiking our judgey pants sky high?