Since I have first hand knowledge of this subject, I would like to share my findings.
I hit menopause very early in life, and no I’m not telling my age, but it is younger than your wife.
And I have been post menopausal now for 10 years. I had a hysterecotmy in 1983 and hit menopause six years later, they had left the ovaries.
Once I entered menopause, sex was the last thing on my mind, I was trying to deal with an emotional rollercoaster, hot flashes, chills and a really bitchy attitude. HRT made all the difference for me at first, and I know that some women can not go that route, allergies, or risk of breast cancer. Now I said at first for a reason, it is this. I lost all desire for my spouse or any other man walking the face of the earth. I was dealing with my own loss, loss of ‘womanhood’ if you will. It had NOTHING to do with my spouse, and EVERYTHING to do with my mental status. I felt unworthy of love and of attention, I felt that I was no longer desirable. I felt like shit. It took me years to overcome that, and I have.
My advice to you is this, talk to her, have long intimate conversations where you let her know that she is still desirable to you. Let her know that you still love her and want her. And keep in mind that it isn’t you, it is her.
Luvaduds brought out a good point with the unresolved issues in your marriage, and that is where the communication is so vital now. Trust me when I say that if there are issues, it WILL effect the bedroom, and other rooms as well.
Good luck and think on what I have said.