“…Thus the array of conditions that can invalidate a marriage varies significantly, not only across time and space, but even within jurisdictions: a couple married in 1950 might have grounds for annulment today that would not be available to a couple married in 1980. 4 Typically, however, a distinction is drawn between void and voidable unions (Cretney and Masson 1997, 40;Hall 1971).…”