Boys do not dump their immature antics and become men until they reach the age of 27, says new research based on a survey.
Lads do not grow up until they have had their first child by age 29 but would continue to indulge in boyish behaviour such as getting drunk, according to OnePoll.com.
Girls, on the other hand, become mature at 24 with the average woman swearing until she is 26, suggests the study.
Ladies also stop tumbling out of nightclubs at 25 and stop flashing their breasts and not pile on make-up by the age of 23, researchers found.
"The report proves that men simply don't grow up as quickly as women. They are still likely to indulge in some sort of immature behaviour," the Daily Star quoted a OnePoll spokesman as saying.