"I'm a perfect example of the grumpy, old man. I'm really good at it"

Ned Beatty's quote is a humorous method of revealing his age and the truth that he is growing older. He is suggesting that he is ending up being a stereotypical bad-tempered old man, which he is quite good at it. He is likely referring to the fact that he is becoming more irritable and restless as he ages, and that he is embracing this part of himself. He is also likely satirizing himself and his age, as he understands that he is ending up being a grumpy old man. His quote is an easy going method of revealing his age and the reality that he is growing older, and that he is welcoming this part of himself.