How many years old are the oldest known musical instruments, bone and ivory flutes found in caves in southern Germany?

Answer

42,000 years

The oldest flutes, from Geissenklösterle cave, are carved from bird bone and mammoth ivory, and a vulture-bone flute from nearby Hohle Fels still has its five finger holes. Humans were making music tens of thousands of years before farming, writing, or the wheel.

Source: University of Tübingen / Higham et al. 2012 radiocarbon dating