I get really hot and sweaty, red face, then it changes within 5 minutes. I'm 50yo, nearly 51. Had a hormone test last year and was told I still wasn't even peri. My DGM had a child at 49yo, nearly 50, and my DM didn't have the menopause until 56-57. She had regular blood tests, for other reasons, and one time she was not in the menopause, the next time it was over.
Both went through very fast menopauses, within 6 months from beginning to end.