In Canon, it’s presumed that Quinlan Vos survived Order 66. He was listed as a priority target for the Sith Inquisitors who were tasked with hunting the remaining Jedi down. They never found him, however. So, he either died during Order 66 or he hid well and lived the remainder of his life out in peace. In the Legends continuity, he survived Order 66 and lived the rest of his life out with his wife and son.