Hi,
Thanks, it certainly looks like the most probable couple.
I'd missed them when I looked at the IGI site.
I didn't know their DoM and you get an awful lot of Josephs marrying Marys in a, say, 20 year span.
I suppose that there is no absolute guarantee that they got married in Staffordshire, particularly if Mary came from outside the county.
I've just had another go at searching for Joseph Williams marrying Mary ? in 1816 +/- 10 years (first child born in 1826) in Staffordshire, and there are 15 hits. 4 were the same marriage in 1806 which makes them too young, but the other 11 are possible.
Obviously the greater the difference between the marriage date and the DoB of their first known child reduces the likelihood. 16 years is a bit long, but older children could have left home by the 1841 census where I first found them. There is a marriage in 26/12/1810 in Newcastle-under-Lyme to Mary Worrall b. Abt. 1789, this Joseph has a DoB of Abt. 1785, but census DoB are notoriously inaccurate in 1841.
Discounting duplicate records and those prior to 1810 there are 8 possible distinct marriages, only 2 of which give the ages of the bride and groom, the 1810 marriage and the one you found.
Peter.