In another moment he was flying down the street with his pail and a tingling rear, Tom was whitewashing with vigor, and Aunt Polly was retiring from the field with a slipper in her hand and triumph in her eye.
There are no more uses of "vigor" in the book.
Show samples from other sources
And we ourselves assembled here today, who are still most of us in the vigor of life, have carried the work of improvement further, and have richly endowed our city with all things, so that she is sufficient for herself both in peace and war.
Thucydides -- Pericles’s Funeral Oration
A group of loudmouthed white-haired old ladies, each trying to talk over the next, a few of them texting, the kind of elderly people who have a baffling amount of energy, so much youthful vigor you had to wonder if they were trying to rub it in.