What's really fascinating is the reaction of their adult children. Many of them are not at all happy about their parents looking online for love and discourage them from doing so.
They often argue that they are concerned for their parents' welfare in an environment that they know little about. But considering some of the extreme reactions mentioned in the story, I suspect there's something deeper going on; something more to do with culture.
The phenomenon reminds me of gender issues. That is, despite all the politically correct talk about how gender roles are much more relaxed nowadays, many men still feel threatened by women in the workplace, and a lot of women really don't like it when men adopt a domestic, home-making role.
A similar thing is happening here, but with age instead of gender. The world of online dating is still widely seen as a younger person's domain. When older people do it, many youngsters see it as a provocative, subversive act, almost an invasion of their turf. That's why they dislike it so much and demand that the wrongdoers "act their age".