If you are unmarried for long, you will have kids late. And human maturity also depends on raising kids. A person who raises kids becomes a better away way, way, way better person. This is why married people are more trusted in society. They get jobs easier. They get business easier. But the biggest reason to marry is the command of the prophets pbuh
The Prophet, peace be upon him, said meaning indeed. This world is a provision, and there is nothing in this world provision better than a righteous woman. This means the unmarried righteous women are a form of rizq for the men they marry. And righteous men are rizq for women they marry. So if you are able to marry and you do not marry, it’s like withholding a resource from its recipient, like a grain or fruit, and refusing to sell it or even give it to the people, letting it spoil in the process.