Hi Anders,
here it is from my own handwritten songbook, which means that I don't know how reliable the lyrics are. They can be anything from my own transcription to a copy from a printed source (on rereading: the lyrics sound to good to be my transcription). I can't help you with all the other questions

Wolfgang

EIGHTEEN YEARS OLD

I'm eighteen years old today, mama,
and I'm longing to be wed.
So buy for me a young man
to comfort me, she said,
you must buy for me a young man
who will stay with me all night,
and I'll roll him in my arms,
he'll be my heart's delight.

Ah, hold your tongue, dear daughter then,
or folds I will pull down.
Your silks and satins I will pull down,
you must wear your morning gown.
I'll send you to the meadows
for to rake and mow the hay
with your pike and shaft all in your hands
you must earn your drink and take.

Ah, hold your tongue, dear daughter then,
I was forty before I wed,
and thought it was late, I thought it no weight
to carry my maidenhead.
That may be the way with you, mama,
but it isn't the way with me,
for I'm young and airy, light and crazy
and married I long to be.

Ah, hold your tongue, dear daughter then,
and I'll buy for you a man.
A man for me? Oh, mother, she said,
you must hasten, you must and can.
The sooner the better, oh mother, she said,
you must hasten a man to me
for I'm young and airy, light and crazy
and married I long to be.