John's 1863 marriage licence/bond appears under "Cheshire Marriage Licence bonds" The form reads "aged .......... and upwards" and "21 years" has been entered in the space provided. This has been transcribed as "born 1842" which does not reflect his 1831 baptism (opening post).
There is a later 1868 licence entry for a John Coward, mariner marrying a Mary Jane Grigg. Again the space "aged ....... and upwards" has been completed with "21 years" with both bride and groom being transcribed as "born 1847".
The Parish mentioned is "Walton" which links to the 1866 Walton on the Hill death of an Elizabeth Coward.
John Coward's address on the 1868 licence is 13 Buck Road, ......... on the Hill" - cannot make out if it is Walton.
Added - I initially checked licence for marriage status and failed to spot it. However, revisiting record I see "bachelor" - not the "widower" I was hoping for. Married Holy Trinity, Walton. Sight of marriage cert. required?