It's an entertaining thread, eh?
I've never met any librarian who is not geriatric. I saw a teacher who was relatively young (in her early 30s, which is getting long in the tooth for women because of the biological clock) on Match, but when I messaged her she read it and never responded.
I saw a nurse in our hospital who I'm vaguely interested in, but not really. She seems like a nice person, but she's chunky. When she's wearing her nurse's uniform, she has this weird spare tire around the area above her waist -- it's like a muffin top, but not because of her scrub pants. It's just a spare tire, which is pretty unattractive, particularly because I think she's in her early 20s, when she's as fit as she's going to be.
I guess you could argue "beggars can't be choosers," but I'd be going into it only semi-interested in her. It's basically like "eh, there's nobody else around ...wanna go out?" So I don't know if that would really be fair to her, either, asking her out.