I was searching on web for any similar info. I am 42, had my left ovary removed when I was 29 due to a benign dermoid cyst. At the time the doctors assured me that current research showed that women with one ovary usually still had their menopause at about the same age as their mother.
My mum had her last period when she was 53, after that she was on tamoxifen for breast cancer so her periods stopped, so I can't be sure when her menopause would have occurred naturally.
My gran (my mum's mum) had one ovary removed as a child (not sure of reason why), and had her menopause at 36.
To cut a long story short, I have had just two very light periods in the past year, plus cannot bear hot weather any more! Definately not pregnant. I have done two home menopause tests, both very positive. My GP has sent off blood to test my hormone levels. At moment I am waiting for the results, but feel sure results will show menopausal levels.
Judging from my family history, it would seem that having one ovary removed does tend to bring on an earlier menopause.
Hope this info helps,