By Syndicated Content Kurt Krieger/Corbis via Getty Images; BMG Mick Jagger turned 78 Monday and a couple of the Rolling Stones frontmanâs band mates took to social media to share some birthday wishes with him. Keith Richards wrote in a Twitter message, â[Wishing] you a Happy Birthday. See you very soon!!! One love, Keith,â along with a photo of him and Mick smiling and with their arms around each other. Meanwhile, Ronnie Woodtweeted his own note to Jagger that reads, âHappy birthday Mick! Have an amazing day, love Ronnie x.â Wood also posted photos of two portraits that he painted of the legendary singer.