Bowie at 67 - the post

With utter confidence I mentioned to someone that it was David Bowie's birthday and the cavalierly added "He's  70."  Why did I think that?   I knew that in 1987 (27 years ago) DB was forty, because in the Rolling Stone issue pictured here (when "stylish" DB was at the sort of nadir of naff dressing, btw), old Kurt Loder starts the interview proceedings off by wish Bowie a happy 40th birthday.  But, even more odd, I was so convinced that Bowie was seventy, or that was so the overriding thought process, that when I signed for a package earlier I put the date as 1/8/2017.  ?!?

So - what exactly is going on here?  I have a slight headache, too.  Is this a brain tumor?  Is this, at long last, death?