The Rolling Stones band-mates also helped him mark the occasion on social media.Ronnie Wood and Keith Richards took to Instagram to honour their longtime pal - as did other music stars. Keith, 76, who co-founded the band with Mick in 1962, posted a throwback with his friend, of the duo fist-pumping during a performance and captioned it: 'Mick, Wishing you a Happy Birthday! Love, Keith.'Ronnie, 73, who was not part of the original line-up, joining the rock band in 1976, posted: 'Wishing