The oldest toy car (right) is as old as 5500 BCE and was found near the North Kurdish town of Qoser (Kızıltepe). The car is worked on stone, has axles of different length and pre-dates Indoeuropeans by a lot.
Previously the oldest known toy cars were from Turkmenistan (Altyndepe) or Mesopotamia, being dated to the fourth millennium BCE.
Other findings in the same site (also worked on stone) are dolls and whistles, the latter still able to produce sounds. These however could be more recent, from the fourth millennium.