Hello Angie,
Yes, in those days (pre- examinations for Certificates of Competency) he could have been a master at age 20. I have younger masters in my files.
However, I am unsure if this is the same Walter Joss, as that would have made him a Captain at approximately 20 years of age. I would have thought that was unlikely ?
Here is a link to online volumes of Lloyd's Register of Shipping:
http://www.maritimearchives.co.uk/lloyds-register.htmlThey are searchable and, (smile), with Joss being a short name, there won't be creative truncations to make it fit into the narrow column allowed for master's name.
The book "Dictionary of Tyne Sailing Ships" by Richard Keys lists him as master of:
ANDROMEDA, 29 March 1833
HARVEST HOME, 3 April 1843
AMAZON, 22 September 1849
JANE, 21 December 1849
ALICE THOMPSON, 31 October 1854
plus two others that I can't name for you now because I don't have the book here with me.
10 May 1850, Joss and crew and some supplies were rescued from the sinking JANE off Cape St. Vincent en route to Quecec by the BRILLIANT. There are two references in Newcastle Courant newspaper on Friday, 31 May, 1850, and one in the Caledonian Mercury on Monday, 3 June, 1850.
Walter is not listed in Lloyd's Captains Registers, but there are 8 others with surname Joss (possibly kin?).
http://www.history.ac.uk/gh/capintro.htmCheers,
Westoe