The common denominator of my life

Something that fascinates me in my old age is that I hear on the radio today the same 50s west coast cool jazz that I was listening to when the music was recent. The jazz station here plays tons of it. I also listen to it on my mp3 player. Indeed this is the thing that has changed the least in my life, the music I listen to much of the time, the same Mulligan and Baker and Kenton and such. 50+ years later, same music. No complaints! But it is interesting to me, with just about everything else in my life having changed in major ways.