Maturing Madness
Riddle: When I am young, I am tall. However, when I am old, I am short. What/Who am I?
Answer: A candle. When a candle is freshly lit, it is still tall, but when the candle has been used for a while, the wax melts and the candle gets smaller.
Source: https://riddles.com/index.php/11151
