I started with the perimenopause around 41. Hot flashes are fun...had one every night between 11-12 for months. Along with others during the day, of course. Incontinence, also a blast.
My sleep got pretty irregular for a bit. Vaginal dryness which had never been an issue before...sorry if that's TMI.
It's been more than 7 months since my last cycle so I may make a complete year without one which means I have officially entered menopause.
Honestly the hot flashes were the big sign for me. Being fat I had always had problems with overheating easily but the hot flashes are different or they were for me. Sort of like getting hot from the inside out.