One of the effects of hysterectomy is shortening, scarring and dislocating vagina - that is one of the life long effects of hysterectomy. In addition,as age progresses, the body undergoes many changes among those changes, muscles elasticity are decreased and regresses. Hormonal effects has also a great role to play, without the required hormones, sexual functions are altered and could become sex an undesirable experience.
Resuming an HRT may offer some help so you may reconsider that matter.
I hope that helps.