My Future Wife Is 68 And Says She Absolutely Loves

My future wife is 68 and says she absolutely loves sex. But since her previous marriage, she has developed fibromyalgia and a dry vagina. Thus she worries that she might not be able to perform adequately for me. I am 69 and still going strong with lots of libido and ability. I am willing to adapt to whatever limitations she might have, as long as she tries. What is your advice?