"Secret of long life" joke

Three old men were sitting on a bench in a park when a reporter approached them.
"I wonder if you three would be willing to do an interview and tell us your secret to long life," the reporter asked.
The three old men agreed.
The first old man was asked his secret to his long life.
"I never drank alcohol, I never smoked tobacco and I have been married to the same woman for fifty years."
"Wow, that's really remarkable!" said the reporter. "And how old are you?" he asked the first old man.
"I'm 93," said the man.
The second man was asked the same question on his secret to long life.
"I drank on occasion, I smoked, but not often and I dated some."
"And how old are you?" asked the reporter.
"I'm 91," said the old man.
Finally, the reporter approached the third old man and asked his secret to a long life.
"I dated every woman that would go out with me, I drank until I passed out and I smoked three packs of cigarettes a day."
"Wow!" said the reporter. "And how old are you?"
"29," replied the man.