In Scandinavian mythology there's only one person who can beat the god Thor in a wrestling match: the elderly woman Elle.
When Thor was asked to wrestle her he laughed, thinking it would be the easiest win of his life, but he had to admit defeat within minutes because Elle is no ordinary old lady. She is the personification of aging itself, and nothing can beat age.
I would pay to see this in the MCU, just as an end credits scene. Imagine Chris Hemsworth being turned into a pretzel by Maggie Smith.