To me, the red flag would be when someone feels it's totally realistic to imagine someone who's 10-15-20 years younger then them finding them attractive and wanting to date them and it's going to work out great...but don't want to even consider dating someone who's even just a few years older than themselves. It's like they don't want to be judged themselves based on their numerical age...but they want to judge other people on their numerical age.
But come-on folks, don't we beat this subject to death about every other week, month, year...?
Everyone wants to be younger in their profile. People lie everyday about their age. And I catch them everyday when they lie. For me, I am proud of my age. I am 50. This just means I've taken care of myself, and look good for my age. I am also more experienced in life, and have more wisdom. This means I have seen all the tricks in the book, and out of it.
UnixGrand -- take down your mirror for a minute and read my profile. (lol)