Our expert says:
What usually matters most is the person's personality and youthfulness in their behaviour. Some teenagers are awfully old and set in their ways and behaviours, and some folks at 50 are youthful in how they live. It sounds, though, as if you are more concerned that your friend herself may be too immature for a serious relationship.
As to whether he is already maried, she of course would be stupid to embark on an affair with him before she can be certain that he is not, and should get to know his friends and visit his home, maybe with a mutual friend.
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