Please explain
I second this.
I think he means that the ideal marriage is the Holy Family which had a large age gap.
Blessed Virgin Mary at her youngest would have been 12, and 15 at her oldest.
Saint Joseph at his youngest would have been 30, and his older we don't know, but different Saints have said 48 or 60+.
So we can see the smallest possible age gap between them was 15 years. So really Catholics should not have any issue with marriage between teenage girls and men in their 30s.
Functionally it makes sense. A man needs time to work on himself so he can provide for his family. A house, food and other resources. This also ensures his wife can stay at home and do her duties and the children can be homeschooled. The man having age and experience in life will also make him mature allowing him to be a better father and husband.
The women being young will be produce more healthy offspring and will have more energy to take care of them properly, and this will give her experience so it gets easier as she ages. Having children early also prolongs her fertility and gives her numerous health benefits due to cell exchange when pregnant. Also the woman being young also stops her from destroying herself by not making bad irrational decisions, such poor decisions can really make or break a marriage.
This is not a new idea, Aristotle said the ideal age for marriage was ~18 and ~37 respectively. For similar reasons to above. And he didn't have "science" to tell him these things, just wisdom and knowledge from history.
Unfortunately the modern world heavily stigmatised age gaps, especially if the women is in her teens. This is simply due to Jєωιѕн/masonic (feminism) influence.