I mean, you're asking on a Volvo forum... I think all here can agree that the Volvo is a better choice.

You alluded to a couple things though, your wife and DIY work...
1. Happy wife, Happy life. That said, if your life is going to be miserable driving around in that boat and fixing old-Ford problems, then perhaps no one will be happy and you should convince her that this Volvo is the best thing for you both. Bottom line, make sure neither of you come through the decision with any resentment.

2. Service. You mention getting older and less able to work on the car. Do you mean to say that you would consider paying someone else to diagnose and work on your car? You might factor in your potential service experience into your decision. Is there a known honest and reliable dealer or indie specialist in the area for either Volvos or Fords? That's what my parents decided to do when they bought their 2008 XC70 about 8 years ago. Their service experience has been roughly similar to your except they went to the dealer for everything, including oil changes, until the dealer closed. Now they go to a local European car specialist. They've been happy with those experiences. My mother is happy to have a "professional" doing the work and my father has been happy with his interactions with the shops. Their wallet is undoubtedly lighter, but they are happier and carrying less worry.

If all else fails, you and your wife choose your favorite car and stage a race. The winner gets to keep their weapon of choice!
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XC60 / Odyssey