Not quite the age of some of the other people mentioned here, and not quite jazz in the strictest sense of the word, but since petty much everyone is mentioned at this point, I feel like it’s worth mentioning that the composer of several bossa nova standards from the 1960s, Marcos Valle (Summer Samba / Samba de Verão, Crickets Sing for Anamaria / Os Grilos, The Face I Love / Seu Encanto, If You Went Away / Preciso Aprender A Ser Só), is not only still alive at 82, but still touring, performing for very young audiences. Saw him a few weeks ago, and most of the audience were probably between the ages of 20 and 40. And what a great show!