Can a man really be happy and satisfied with just one woman in his life, never experience his youth?

I feel sorry for my younger 29 year-old brother. He settled down too young when both were just 21 year-olds. He impregnated his then girlfriend (now wife) when both were 19 year-olds in college and become a father at just 20 years old. To make matters worse, it wasn't just one child. They had twin daughters.

That's the only woman he's been with. She was also a virgin but standards are different for the genders. He never really got to enjoy the youthful stage, have more fun, have a more carefree life nor have more experience with women. He claims to be happy but can a man really be happy with just one woman in his life? He never really enjoyed his youth.

Can a man really be happy and satisfied with just one woman in his life, never experience his youth?
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