I see from the 1841, that they were both born 1796 +/- 5 - in 1851, Jane, now a widow, is down as born Chirk, aged 57 (so born circa 1793 - can't find a suitable baptism)
This is the nearest I can get for a marriage:
Ruabon, 17 Dec 1814
John Johns and Jane Davies, Jane signed, John made his mark. Witnesses: William Lloyd and Ann Davies
I'm not all that happy with this so will have a better look later - need to follow this couple up and/or get some earlier births of children.
Gadget