I actually learned about it from YouTube. There was a reference here at Ageless to a video by "Amy and David" a couple with a 33-year age gap (she's 27, he's 60). As most of you know how YouTube works, when you watch a video it's automatically followed by other videos of the same topic. The "Amy-David" video was followed by "Joe and Angela", a couple with a 39-year gap (21 and 60). If you read the comments there's a link to their web site, which is the above mentioned site (which I took down because of site policy).
There are a lot more resources for people in age-gapped relationships today than there was even 10 years ago.
Like Abraham Lincoln once said, "You can't believe everything you read on the Internet."