My mom just lost her cat a few months ago, and is starting to think about possibly adopting a dog. She's definitely not in any rush right now, we're just starting to talk about it. In the past, we'd toyed with the idea of her adopting an older adult or senior dog -- male/female, doesn't matter -- but healthy. My mom is in her 50's, my grandma (who lives with her) is in her 80's. They both WALK. They love to walk, walk, walk! So an older, but calmer dog, who can still walk longer distances is preferred.
While my mom does have some experience with a highly DA dog, having been Kane's "dogwalker" back in the day when I was single and had to work long hours (poor lady), she'd definitely prefer a dog who is tolerant of others. Only to avoid problems on walks -- I highly doubt my mom would ever have/want a multiple dog household. She just comes over to our house and visits/spoils all her "granddogs" when she needs a fix!
Basically, I've browsed some of the rescue section, and it seems most dogs in our area advertised are always puppies. I kinda just wanted to put this out there in the event a rescue had an older dog they were looking to place. My mom may just be looking for her perfect fit soon!