Wikipedia is great that way. That's how I checked Brubeck's age.
The fantastic thing of that show was that he brought on a whole quartet. He was touring behind an album (London Flat, London Sharp) that he told the audience he had composed in perhaps the past decade or so (at the time). He said that his band at the time couldn't play the music (he was a master of complex time signatures), so he sat on the music until his band could play it. At which point he finally recorded, released, and toured it. It is one of my favorite albums ever as the man was a composer and pianist like few others. He also lived in the vicinity of where I was living, so he was a local superstar.
Other memories of that show were that he explained to the audience that he composed a piece of music everyday from the time he was in college. He often threw them out, but he didn't know how not to compose. The show was short and sweet (70 minutes), and when the audience asked for an encore, the quartet came out played a standard lullaby (one everyone would know) in a Brubeck style. It was fantastic. He turned 90 a little over a year later, and I believed he passed on a little after his birthday when he turned 91.
It's all a great memory. I'm a pianist, myself, so I get amazed by anyone that can play a piano well, especially jazz pianists whom I have never been able to emulate.
Oh yeah... I'm jealous of the person who saw Ruben Gonzalez. He was an awesome pianist too and performed into his 90's. I didn't discover him until after he past on.