This is the definition that any women who has not had menses for at least 6 months

This is the definition that any women who has not had menses for at least 6 months and is around menopause age say 45-50 is said to have achieved menopause

shouldn’t the answer be 12 months ?

12 months was used earlier I guess

I also had the idea of 12 months but it has changed

And and bleeding after that is to be considered post menopausal bleeding

Normally a 1-year period of amenorrhoea after the age of 40 is considered as menopause. However, vaginal bleeding occurring anytime after 6 months of amenorrhoea in menopausal age should be considered as postmenopausal bleeding and investigated. Thank you.