Jerry Mathers – 70

Jerry Mathers was 8 years old when he joined the cast of Leave It to the Beaver, portraying Theodore “Beaver” Cleaver—the role that remains his most lucrative and famous one. When Mathers became an adult, he took a break from acting to focus on his education. He made his acting comeback in the ’80s when he reprised his role in Still the Beaver. He then appeared in more series and films through the ’90s, even continuing to land roles until today. His last acting credit was in the short film Lucky Day in 2015.