Clint Eastwood is an OG motha fucka. He's had a successful and illustrious career spanning many decades. He's banged more bitches than most could ever dream of, and he's still cool as fuck, even in his old age.
Chuck Norris is a hack who was working on info-mercials until some brilliant kid decided to make "chuck norris jokes." His career, which was little more than "white guy in shitty kung fu movies" before, now consists of doing commercials for games he's never played, and ruining movies by refusing to be in them unless they're PG-13.