I'm 48 and I do feel like I'm treated a little differently, especially by men. I have a small social circle which is mostly work friends and family; the women are still fine because I'm still the fattest.

We'll see what happens when I get thinner. Most of my co-workers are married men so I haven't seen a difference in the way they treat me. I notice it mostly with men I don't know.
I saw a really attractive man at Safeway the other night who said "hello!" to me, then made eye contact with me several more times in the store. He was buying batchelor food (six-pack and a package of meat, hahaha). I wasn't sure what to do other than meet his eye contact and smile. And at the gym, I almost bumped into a man as I was heading into the locker room; we both said, "excuse me" with a smile and he reached out and almost touched my arm. Not in a creepy, grabby way; but it was still something that I'm pretty sure he wouldn't have done 55 pounds ago.
The only person who seems really disturbed by my weight loss is my best friend of 20 years, who is struggling with her weight right now. She has made several remarks about me being "too skinny" and how thin my legs are. But I think that's just because she is struggling right now, so I try to see it from her viewpoint and let it go. But yeah, Losermom, this is the one that's most difficult because I care most about her. I know it's just because she's struggling, but it still makes me feel self-conscious and sad.