Most of your questions can’t be answered without knowing the story of the “real” third part. If we focus only on the first two games then some of your questions can be answered with the hints in the game(s):
Nothing much, actually.
America, near the Caribbean Sea (because I doubt that the parents would travel around the world at that time to visit a theme park). Maybe one can give a more detailed answer looking at the clothes of the parents.
A kid. In the games he is not quite yet an adult because there are jokes about his beard.
Here we have not enough information AFAIR. But you can see them at the end of MI2.
According to the second part: Yes.
If we consider his age: Nothing. He went to school and would like to be a pirate.
Again, there aren’t enough information in the game, but: Who don’t wanna be a pirate (as a kid)?
If I’m not mistaken: to buy, 16 for beer and such, 18 for hard liquor.
To drink, I don’t think there’s an official minimum, unless it’s the same for buying. I mean, it’s not like in the USA where you risk a fine or jail time if you let your underage son take a sip of your beer.
By the way, it dawned on me quite “late” that he says 21 because it’s the American minimum age. But I just understood that he wanted to be declared older than he actually was, and he almost said his real age.
Actually, people under 18 can’t buy take away alcohol. But if you are 16, you can buy alcohol that you must have on the spot.
This law came out in 2012 to comply with european rules.
it came out very late in comparison with US or other european country since alcohol addiction in Italy historically has been a minor problem, in comparison with these countries.
Recent statistics confirm this, and the total acohol cosumption is consistently decreasing in the last 10 years, but underline also that -especisally amongst youngsters- the use of wine is decreasing and the use of strong drinks is increasing.
Why odd? I don’t know the european requirements, but every nation can make its own law according to it, so laws can differ from country to country.
As I mentioned, Italy has a 18 year limit for TAKING AWAY, but 16 limit for alcohol to be consumed on the spot. Here is the full list from which I took my data (sorry, I didn’t mention it earlier)