Well, it seems my little September the 19th mystery was either too obscure, or too boring, for a lot of people.
In case you missed it, and in case you care, the answer was "40". As in the title of the song. As in the difference between 2007 and 1967, the year Ricardipus started busting funky moves and making snide remarks. As in the reason it has become necessary to modify my profile so that it no longer reads "slightly under 40 blah blah blah".
Anyway, thanks to those who figured it out (with generous hinting). Oddly enough, it was Tilly who got it first - a blogger I remember hearing of years ago when I first started reading Zoe's blog, but whose blog I'd completely lost touch with. Hi, Tilly *waves*.
So, now that I'm officially Over The Hill™, I can look back on things and realize that my completely selfish and useless goal of owning an objectionably expensive and gas-guzzling sports car is likely never going to happen... shame really, 'cos they've got an awful lot of them for sale at this website I discovered. Or maybe I could borrow the shiny, red Ferrari F430 Spider, or its friend the white Lamborghini Gallardo, both of which reappeared transiently at the construction waste transfer dump a little ways away from here (I still suspect mob activity: expensive Italian sportscars and the construction and "disposal" industries... hmm. Maybe The Sopranos has been colouring my thinking. On second thought, I think I'd better not ask to borrow either one.)
Anyway, it should be clear by now that this new-found age of mine has done absolutely nothing to give me wisdom, clarity of thought, or new levels of eloquence, and as a result you end up with the same old bumf in this post. I'll just leave you with the following photo of a happy-go-lucky, 30-year-old Ricardipus surveying the wilds of North Wales, not considering for a single moment that his hopelessly muddied-up, colour-tweaked, posterized and otherwise violated countenance would end up posted on the internet as the coda to what has, by any method of measuring, turned out to be a really, really lame post-birthday post.