You're right with your observation about the 'older' demographic, but perhaps not specific enough, as this group (arbitrarily set here at > 60 years of age) may encompass a third or more of the entire population. Pendragon's mother-in-law belongs to an age group a generation beyond the group DK is referring to (let's equally arbitrarily say 55-70 years old).
For various reasons, this oldest group is not exactly known for embracing the digital age, and therein lies the rub with Pendragon's suggestion for a group geared to seniors: you'll have to be somewhat familiar with the internet and forums to go look for specific forums like the ones suggested. This doesn't disqualify the suggestion, but points at specific issues associated with the target group.
