The question is difficult to answer definitively as there is no official ranking or title for "most flexible boy in the world". However, a well-known contortionist is Daniel Browning Smith, also known as "The Rubberboy," although he is not a boy, but rather was born in 1979.
It is important to note that flexibility is subjective and can be assessed differently depending on the criteria used (e.g., range of motion in specific joints, ability to perform certain poses). Therefore, claiming someone is definitively the "most flexible" is challenging without a standardized measurement.
