I was only diagnosed with endometriosis at the age of 42, during surgery to remove an ovarian cyst (and the ovary it was growing from), but within 5 years, I was having endless endo pain caused by my hormones going haywire, aka peri-menopause.
I asked for referral to a gynae team that specialise in endo, as I hoped they'd agree to a full hysterectomy. I couldn't see anything else that'd help, having tried various pills and injections to stop periods, and pain killers were not helping.
So whether it was clinically necessary, possibly not, as they can operate and just remove any endo they find, but at my age, if they were operating, I wanted it all gone. And I made that clear as soon as I spoke to the consultant. She listened to my pros vs cons, and agreed straight away.
Although she was surprised that I'd asked for my remaining ovary to be removed, but after asking me a few questions to confirm my understanding of things, okayed that too.
I wanted my hormones to drop to a steady level, I didn't want the chance of developing another large ovarian cyst, or to have an ovarian cancer risk. My ovary was doing me no good at this point.
A very personal decision I know, but absolutely the best thing for me. I'm pain free, and have got my life back.