For having lost but once your prime, You may for ever tarry; (15-16)
As he's done throughout, the speaker suggests that if the virgins don't
act during their "prime," that's it – game over. Interestingly, he
describes the bleakness of their post-prime years in terms of
"tarrying," which means delaying, prolonging, protracting, etc. Does he
mean they will prolong their unmarried state, or spend the rest of their
life being idle?