You know this is an old joke because it features a crowded streetcar:

An old gentleman invites a young lady on a crowded streetcar to sit on his lap, saying that he is too old to get up and give her his seat, and by the same token, too old for it to be wrong for her to sit on his lap. After jolting along in the streetcar for a few blocks, with her bouncing on his lap, he says, “Miss, one of
us will have to get up after all. I’m not as old as I thought I was.”

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