At 15 years old, you are not a kid any more. Chimney sweepers used (often sold to them) boys, 5 to 10 years old (sometimes as young as 3) to climb in the chimn

At 15 years old, you are not a kid any more. Chimney sweepers used (often sold to them) boys, 5 to 10 years old (sometimes as young as 3) to climb in the chimneys to clean them (quite dangerous work). A minimum age of 14 (then 16) was put into place in 1834, and started to be enforced in 1875. (Note that this might have taken much longer if innovators hadn't been lobbying for child-free technics to do it.)