Its more attractive ofc all things being equal, even better when older. If you revisit the question and look ay it from a noys perspective, then:
Not more attractive if they are insecure/ immature and feel intimidated by the idea someone works hard or is smarter than they are.
Being intelligent as of itself isnt going to override looks, fun personality/ pleasurable company and availability football playstation etc.
Be assured its a very good trait to have though. so be proud of it.