What Does It Mean To Be A Teen?

What does it mean
To be a teen?
At sixteen one may smoke
But may not buy
This means to die,
Which some may say is a joke.

One may not star in films obscene
Until the age of eighteen,
Though sex at sixteen is OK
With a guy
Where the difference in years
Will bring tears
To a parents eyes.
Such is the law in the UK today.

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In the UK it is legal to smoke at sixteen but illegal to sell or gift tobacco products to anyone aged under eighteen.
Until 2003 it was permissible for those aged sixteen to...