I'm tall when I'm young, I'm short when I'm old. What am I?

Common Wrong Answers
“Tree”
While trees do grow tall when young, they do not become shorter as they age; instead, they typically grow taller over time.
“Human”
Humans do not become shorter as they age in a general sense; they may experience a slight decrease in height in old age, but this is not a defining characteristic.
“Building”
Buildings do not change height as they 'age'; they remain the same height unless altered or demolished.
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