I'm fourteen!
You say this when you're trying to get out of paying for something and you're too old to be convincing but still too young to be respected. You're basically screaming 'I don't have money!' in a very dramatic way.
'I'm fourteen!' I said, even though I was 16 and had $20 in my pocket.
'I'm fourteen!' I yelled, trying to get out of paying for my soda.
'I'm fourteen!' I said, even though I had a job and was clearly not poor.