Why does Veronica Maggio pronounce gammal as yammal in Gammal Sång? A difference between regions?
I think that's probably just a mishearing - I hear her singing gammal with a hard g consistently.
It's not grammatically correct to join two sentences with a comma; it should be
"You are old; I am young."
In most cases, yes; however, according to Strunk's Elements of Style, "If the clauses are very short, and are alike in form, a comma is usually permissible." This sentence fits both requirements.
Not really, ancient is older than just old. We say antik in Swedish. Plus, pedantic translations are not supposed to be accepted unless they're also reasonably feasible. :)
I must be conflating gammal / gamla, from the de facto anthem of Sweden, "Du gamla, du fria" / "Thou ancient, thou free".