As far as I am concerned, I don't think there is age bracket for a man to get married. If all things are equal, even as early as twenty years of age, a man can get married. But what I am against is people sucuumbing to pressure from the society, which could be from their parents and relatives as well as friends and colleagues on when to get married. And many guys has fallen for this kind of pressure in getting themselves into marriages that they didn't want to, and the result of such hasty decisions has led to untimely termination of the marriages simply because they were not prepared for the union.
In addition to this pressure aspect, many guys are not ripe to get married. Ripe in the sense that they are not financial buoyant to shoulder the responsibility of putting a woman in the house. Some of them get married and they unable to cater for their wives and kids. Another thing is that some men are not yet mature enough to live with a woman. It takes great sense of maturity for a man to tolerate a woman with all their mysterious antics.
As so, marriage by men shouldn't be based on age. Once they have everything working all together for them in this regard, they can decide to get married at any age. And besides, marriage is not a do or die affair.