Wish I had some good advice, but my situation is the opposite. She encourages me to go riding when she's working! And many in our group are retired females, and she isn't bothered by that. My wife will be retiring soon, so we will be able to ride together more, which I'll enjoy, as will other members of our group who have met her. Maybe explain the health benefits of cycling, that you wish to stay healthy for her. Maybe that might work?