Age and Sexual Desire/Need

I am 60 and my wife is 68. We have been married 33 years and together 35 years. We are still madly in love. I still tell her every day that she is the most beautiful/sexiest woman on earth. Anyways two years ago, she said her sexual desires/needs were waning. We rarely have sex now and when we do, her orgasms are small. Is this normal aging process or am I getting BS. WWHT

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