Back in 1983 I saw David Bowie on his Serious Moonlight tour (at the Perth Entertainment Centre). He was a veteran then, at age 37.
I always remember that concert, since it was the only one I'd ever seen. (Well, the only one of its size. I've seen the odd pub gig, of course! Oh, and I did see Rodriguez, of "Sugar Man" fame. That was a disaster -- seemed he'd binged on the "sugar" that night!) Because I remember that Bowie concert so well, it's kind of a marker for that whole time in my life.
The amazing thing is that it doesn't seem that long ago at all. But it's 23 bloody years! I'm 42 and working at the uni I was studying at in 1983. And David Bowie has just turned 60.