“versus being pressured into marriage at a point where they cannot even legally buy alcohol.”
As Frum Jews whose attitudes should come from the Torah and from our Mesorah, I don’t think the legal age to buy alcohol should have any bearing whatsoever on the age that we consider appropriate for marriage.
And by the way, I think the legal age for buying alcohol in EY is 18, and even that is a recent law (or else, it’s only recently that they started enforcing it). It used to be that a 5 year old could go to the local makolet and buy wine.
I also happen to find the word “pressured” to be offensive. Most people who get married at 19 or 20 are doing so because they want to. There is no more pressure on them to get married at that age than there is pressure on girls in other societies to delay marriage, and/or to go to college. Actually, I think there is probably a lot less.