Norman Lear credits "love and laughter" for his longevity on 100th birthday

On his 100th birthday, Emmy award-winning television producer Norman Lear said the secret to his long life has been laughter.

On Wednesday, CBS News chief medical correspondent Dr. Jonathan LaPook posted a video of Lear to Twitter, in which the TV legend shared his secrets to remaining healthy and alert at 100. 

"To look like me and sound like me is to have all the gifts of the culture, the gods, the fates, and the people I've loved, and loved me in return," Lear said on his milestone birthday. "I couldn't emphasize that more. I have been cared for, and I have cared, and I think it's mattered a lot."