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I don't think the bible said something about when. A man should get married but the bible did mention that Genesis 25:20-21 (KJV)
20And Isaac was forty years old when he took Rebekah to wife, the daughter of Bethuel the Syrian of Padan–aram, the sister to Laban the Syrian.
And Genesis 26:34-35 (KJV)
34And Esau was forty years old when he took to wife Judith the daughter of Beeri the Hittite, and Bashemath the daughter of Elon the Hittite:
That was the old testament account now heading 30 I think it's time
Pastor Chris explains when but his answer is not related to age. His answer is when a person is responsible and knows the mind of God as pertains to who their future spouse is.