system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do things lose their smell?

What makes things stop smelling the way they do? Additionally, what causes things to get specific smells after getting older?
gpt
When you smell something its receptors in your nose react withsmall particles of the thing you smell. So when something produces smell it releases small pieces of itself in the air. Eventually it will run out of pieces to release and lose the aroma.