I have found similar experiences with movies. Like the Cheech and Chong movies...absolutely loved them all for years,..but watched a couple recently and the luster has faded....I noticed the same thing with comedians though.... Richard Pryor used to have me rolling on the floor...listened to an old tape I had last year....and it was not that funny....perhaps the times have a lot to do with it....but later,..you just do not relate as well.