I guess Mrs. Grouch and I qualify. We're in out upper 70"s and riding Catrikes.

My advice is to visit a recumbent specialty shop and plan on spending at least a half day. There are MANY variations on the tadpole design and they all ride a little bit differently. If you are new to recumbents, probably your first consideration should be how low are you comfortable sitting. A recumbent specialty shop will be able to talk you through the other design decisions but, if you can't get up and down reasonably easily, nothing else really matters.

To put things into perspective, neither of us has ever been particularly athletic but we do have a significant bicycling background. The last two miles of a typical ride for us would qualify as a Tour D France Cat 5 KOM hill. Not an epic climb but enough to get anybody's attention. We're happy and doing okay.