1 Corinthians 7:36
But if any man think that he behaveth himself uncomely toward his virgin, if she pass the flower of [her] age, and need so require, let him do what he will, he sinneth not: let them marry.
Note 16 at 1Co 7:36: There is quite a variety of interpretations of this verse among scholars. However, most of the interpretations boil down to the same point. This passage is speaking of a man having trouble keeping his virginity (see note 1 at 1Co 7:25). Therefore, Paul's instructions that he had given earlier in the chapter would apply (1Co 7:8-9). Let them marry.
Note 17 at 1Co 7:36: This phrase, "pass the flower of her age," means if she is old enough to be married. The entire phrase comes from one Greek word, "HUPERAKMOS," meaning "beyond the 'acme', i.e. figuratively (of a daughter) past the bloom (prime) of youth" (Strong's Concordance).