"Acest tânăr are părul albastru."

Translation: This young man has blue hair.

[jh963]

Why is păr definitive here?

[Lurch_M]

Both "păr" and "părul" are correct in this case.

[AndyOSC]

Why doesn't "Acest Tanar" translate to "This youth?"

[Lurch_M]

Should be fine. You can report it.