Joseph Leonard Gordon-Levitt (born February 17, 1981) is an American actor, known for roles both as a child and as an adult. He is most known for playing Tommy Solomon on the sitcom 3rd Rock from the Sun.
He was also recognizable for his long hair which he had during his stint on 3rd Rock from the Sun. Even though he has aged well when it comes to his face and features, he still has a receding/ maturing hairline. It looks as if he may be using a concealer such as Toppik. I believe he will be unable to hide his thinning hair in a few years.