The guitarist was with the band from 1984 until 2006.
"We have lost our comrade and brother Robert Young," Primal Scream's Bobby Gillespie and Andrew Innes said in a statement. "A beautiful and deeply soulful man. He was an irreplaceable talent, much admired amongst his peers, In the words of Johnny Marr, 'Throb with a gold top Les Paul -- unbeatable.' He was a true rock and roller. He walked the walk. He had 'Heart & Soul' tattooed on his arm and I'm sure on his heart too. He once said to me 'when we go onstage it's a war between us and the audience.' He never let go of that attitude. Our love and thoughts are with his sons Brandon and Miles and their mother Jane, his wife Rachel, and his immediate family."