The age that men mature completely is 43 - which is 11 whole years after women, a new UK study has found.
Women were regarded as being mature at the age of 32, the research commissioned by Nickelodeon UK found.
Eight out of 10 women quizzed in the study believed men 'never stop being childish' and said the biggest bug-bears were how they found flatulence amusing, eating fast food in the early hours and playing video games, 'The Daily Express' reported.
Staying silent after rows, racing another car at traffic lights, being unable to cook simple meals and sniggering at rude words were also regarded by women as signs of male immaturity.
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Also, females were twice as likely as men to feel that they were the 'grown up' in a relationship. A third had broken up with a man they thought was too immature.
Men whose mothers still did their washing or cooked them meals rated low in the maturity stakes.
Owning a skateboard or BMX bike was another no-no for women, as was wearing cartoon pyjamas or having a cartoon bedspread.
One in four women felt they were the ones who made all the important decisions in the relationship with the same percentage wishing their partner would talk about themselves and their feelings more often.