I am 53, met my DH 30 years ago and have been married for 23 years.
During the past 6 years we had a number of years of very infrequent sex and then 2 and a half years of no sex at all. I was peri-menopausal and found I no longer had much interest and for various reasons our relationship (not just sexual but emotional) had deteriorated. DH never tried to initiate sex, in fact hardly made any physical contact at all, which I found very depressing.
Both DC left home at the same time to go to university which pushed us to have a proper conversation about where our relationship was going. We did a lot of talking and agreed that we would both make an effort to do things differently and we have managed to rekindle the emotional and physical side of things, which we are both very much enjoying.
We found it helped to go away somewhere together so we were out of our normal routine, and he bought me a surprise present of some tasteful but sexy underwear (which he had never ever done previously). I have also been making the effort to take more exercise (though am not overweight) as this seems to improve my mental health.
In the last 4 months I have probably had more sex than in the last 10 years and I feel the urge to initiate it now, which I hadnt for a long time, which makes him feel more positive. I have got through the menopause relatively unscathed. He has finally opened up emotionally which makes me feel more wanted.
I would say there is still hope. I had thought all the spark had gone from our relationship and 6 months ago was on the verge of leaving, as I couldnt bear the idea of never having sex again, but we have managed to turn that situation around.
Good luck, but remember, it is a very individual thing, and if both of you are happy, I wouldnt worry about what anyone else is doing.