Working on the assumption that there aren't too many William Maddern + Eliza Maddern combos, I looked up FreeReg:
https://www.freereg.org.uk/search_records/59b805a4f493fdac54026333/...
Notably, This states that William (that married Eliza Robinson) was born c.1816 (Aged 28 in '44) and his father was John Maddern
Also, that Eliza was 23 in '44 so born circa 1821
There may be a possibility that this is the wrong William and Eliza combo, too.