Two friends of mine brought me to see them for my birthday in 2006. It was nowhere near sold out. Status Quo were great and my friends (both a good bit older than me) knew every song (while I new only 2 or 3), but the three of us were the youngest there by a long shot! There were loads of die hard fans there too, we got talking to a bunch of about 20 retirees from England who said they follow the band when they go on tour and hadn't missed a Quo gig in 15 years... wonder if they're doing the same this tour.
I get notifications from O2 every time a new event is announced in it's venue. I normally ignore them as 99% of the time I have no interest. Twice in the last week or so I've actually been interested in said events. Quo being one, Super League Darts being the other.