The Bethel Woods Center for the Arts says, at its website, that it is located "(a)t the site of the 1969 Woodstock festival." If that information is correct then I'd guess that the farm's address...
Max Yasgur was born on December 15, 1919 and died on February 9, 1973. Max Yasgur would have been 53 years old at the time of death or 92 years old today.