You (and those you date) will be carrying less baggage
I was recently talking to a single friend in his 30s who was bemoaning the dating scene for folks his age. He said, “When you look at it, if a person is reasonably normal, they’ve probably had about one semi-serious relationship each year, or every other year, since they’ve been teenagers. When you get to your thirties, you’re carrying more than a decade’s worth of break-ups, lingering feelings for past partners, trust issues, and disappointments with you.
When you marry young, you and your wife have less exes, old flames, comparisons, and retroactive jealousy of each other’s past relationships to deal with. You can start life together with more of the guileless freshness that lends itself to unabashed and lasting romance.