We're fast running out of veteran animators from the Golden Age of Cartoons. One who's still around is Bob Givens, who animated for all the major studios but especially at Warner Brothers. Among his other credits, he designed the first true model sheet for Bugs Bunny. That should give you some idea of how long he's been around and how much he's contributed to animation.
ASIFA, the Animated Film Society, has extensively interviewed Bob about his career. You can find several videos of those conversations here and a ten minute sampler below. I wish more guys had been interrogated like this while they were still around to interrogate.