Someone who celebrated their 45th birthday on the day I was born (such as the great historian of Babylonian astronomy Asger Aaboe, or Canadian governor-general Jeanne Sauvé) would have been born during the brief presidency of Warren Gamaliel Harding, and the last few months of David Lloyd George's term as British Prime Minister. Stalin had just become General Secretary of the CPSU. It seems unimaginably long ago. (Though I suspect that if I'd done a similar thought experiment at 35, 25 or even 15, I would have been similarly boggled by the passage of time.)
It's a busy day at work today so we'll be celebrating at the weekend. But thanks again, folks.