I was scheduled for a hysterectomy at 69 due to what was thought to be fibroids. However, it turned out to be a massive ovarian cyst and as my uterus was healthy, the surgeon decided to remove both ovaries and leave my uterus.
He couldn't consult me about this, as I was on the operating table when he realised that he was dealing with an ovarian cyst and looking at a healthy uterus.
Certainly, a hysterectomy is a big operation at any age, but age itself doesn't make it more hazardous. Obviously your general health must be good, or your gynaecologist would not be advising operating.
Perhaps you should ask for a second opinion from another surgeon before agreeing to the op. The result will probably be the same advice, but you will doubtless feel less anxious if you have another opinion.
Another point to consider is whether you really want to live with your existing condition? I imagine it must restrict your daily life.
After a hysterectomy, you will need to take care for some time, but will, I am sure be offered after-care such as physiotherapy.
There is one certain benefit: the risk of uterine cancer disappears if you no longer have your uterus and that of ovarian cancer if they are contemplating removing the ovaries too, which is standard procedure in some hospitals in women who have finished the menopause.
The cervix remains, so women are usually advised to continue having smear tests done for cervical cancer, but I believe the risk is greatly minimized after a hysterectomy.
In your place, I imagine I would consent to the operation, but not being a doctor I cannot really adivise you.
I hope you find a solution that suits you.