If anyone thinks he is acting improperly toward the virgin he is engaged to, and if she is getting along in years and he feels he ought to marry, he should do as he wants. He is not sinning.1 They should get married.
References for 1 Corinthians 7:36
But the man who has settled the matter in his own mind, who is under no compulsion but has control over his own will, and who has made up his mind not to marry the virgin--this man also does the right thing.
So then, he who marries the virgin does right,2 but he who does not marry her does even better.
References for 1 Corinthians 7:38
A woman is bound to her husband as long as he lives.3 But if her husband dies, she is free to marry anyone she wishes, but he must belong to the Lord.4
References for 1 Corinthians 7:39
In my judgment,5 she is happier if she stays as she is--and I think that I too have the Spirit of God.
References for 1 Corinthians 7:40