In virtually all cultures, girls are ready to marry (i.e. to start producing children) at a much earlier age than the boys are ready to support the family. It’s a function of biology as much as anything else, and since we can’t criticize the one who did the design, this isn’t an issue to debate (as we could propose causing female not to reach puberty until their mid-20s).
The norm is virtually all human cultures is that brides are younger than their husbands, often by many years. That some people have trouble with this idea is the problem.