That's what a new study out of the UK says. The same study says women mature 11 years earlier, at age 32, which can lead to friction in relationships. Here are some of the other things they found:
Three in ten women have ended a relationship because they lost patience with the guy being too immature.
46 per cent of women have had a relationship in which they felt they had to mother their partner a bit too much.
The average British woman has to tell her partner to 'act his age' more than once a month - an average of 14 times a year.
Any upsides to this? A couple of them......
Four in ten people says that "immaturity" in a relationship is important because it ensures the partnership stays fun and keeps things fresh.
One in three people think a bit of immaturity helps in bonding well with children.
What do you think? Is immaturity actually good for a relationship or have you have to end a relationship because of it?