@MemorialBeach
There doesn't seem to be any discrepancy between the info on MM site and that of the NHS.
THis is from the NHS
Early menopause
Early menopause happens when a woman's periods stop before the age of 45. It can happen naturally, or as a side effect of some treatments.
For most women, the menopause starts between the ages of 45 and 55.
If you're under 45 and have noticed your periods becoming infrequent or stopping altogether, you should speak to your GP.
The slight difference between the 2 sites is that Dr Currie says that in the Western world, 47 is now considered the youngest 'acceptable' age where the risks of early menopause would not apply.
A friend of mine had a fracture in her 50s and was told by her GP that her menopause at 47 was considered 'young'. Her bone density is now being monitored.
The treatment if your periods stop at 45 or soon after is either HRT or the Pill (Qlaira) which is very similar to our own hormones and it's suggested there are fewer side effects.
This is from the NHS site:www.nhs.uk/conditions/early-menopause/
Women who go through early menopause also have an increased risk of osteoporosis and cardiovascular disease because of their lowered oestrogen hormone levels
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Treatments for early menopause
The main treatment for early menopause is either the combined contraceptive pill or HRT to make up for your missing hormones.
Your GP will probably recommend that you take this treatment long term, beyond the "normal" age of natural menopause (around 52 on average), to give you lasting protection.