A "young pretender"

What does it mean to call someone a 'young pretender'? And where does the term come from?

It's a royalty thing. From infoplease:

PRETENDER -- Pronunciation: (pri-ten'dur), [key]
-n.
1. a person who pretends, esp. for a dishonest purpose.
2. an aspirant or claimant (often fol. by to): a pretender to the throne.
3. a person who makes unjustified or false claims, statements, etc., as about personal status, abilities, intentions, or the like: a pretender to literary genius.

And from Merriam-Webster online:

PRETENDER: Function: noun

one that pretends : as a : one who lays claim to something; specifically : a claimant to a throne who is held to have no just title b : one who makes a false or hypocritical show

Interesting ... so someone who is a poseur, claiming to be a social prince or princess, could be considered a young pretender.