I think a part of the problem is that other social media (Facebook, Instigram, Twitter, YouTube) have largely replaced traditional forms as the main source of social outreach, interaction and meeting people. Traditional social forums in general I think are dying or at least slowing down.
I don't know if age gap relationships, like interracial, same-sex, etc., are becoming more or less accepted in society. I do notice that comments in news stories are becoming less hostile, or at least more varied in their approval of age gaps and other relationships. It could be that with more people meeting online through match, dating sites and other online venues, that the disapproval of age gaps that used to be so strong in local communities has lessened from the time when the only option was to meet at church, work or local events. With people meeting people from everywhere, the diversity in types of relationships has also broadened, which serves to diffuse social disapproval. With less need to vent or seek approval, there is also less activity on forums.
Of course, one could also theorize that these relationships are becoming less approved of, which leads to fewer people engaging in them. However, I don't think there's much evidence to support that view. If anything, I think social approval of these relationships has remained much the same, but people now have more options than they used to because of technology.
The important thing is we're there for those who need us.
Like Abraham Lincoln once said, "You can't believe everything you read on the Internet."