Do you qualify for what? I know Disney does not offer special rates for senior citizens (not that you are senior citizens, I just figured I'd throw that out there). They do have the
DAS pass if either of you have special medical issues that would prevent you from standing in line, but you need to be unable to wait in line for one reason or another. If a wheelchair could solve the issue, my understanding is they won't allow the DAS.
If you're just feeling like Disney might be a bit "much," I wouldn't worry! You are still young and it seems like you're both healthy. We visit Disney often with my parents, who are in their 60's, and while they're just beginning to slow down a bit (they spend more time at the pool than they used to, for instance), they go on rides, enjoy the parks, and do basically everything my husband and I do with our kids. The only thing I would recommend based on my experiences with them is just to get
Genie+ to minimize the time you spend on your feet waiting in line. And I would recommend that for anyone, regardless of age.
Hope you have a great trip!