I’m 53
Metal for me begins with Sabbath and ends with Black Sabbath IV
though I do like Metallica..more from Sandman forward..so shoot me I know but I like it better..a wee ballad never hurt...their version of Whiskey in the Jar is great
first metal I recall was Beck work on Yardbirds or maybe he or Page on Kinks
Introduced to heavy metal at a Deep Purple concert in ‘73. The song? “Wheels of Confusion”.