I think it is better for both boys and girls to get married younger, but the parents have to accept that their help will be needed for longer, and the couple have to be willing to accept advice from their parents (or parent substitutes who are around them and see what’s going on.)
Part of the problem with marrying young in the non-Chassidish community is that the culture is that you marry and become ‘independent’ right away. This is a problem. Becoming “independent” is a long process, which can last until a person is no longer marriageable, and none of us are truly independent in life – we all need others eventually.