In case it helps, the DNPRS transcript of the Lesbury parish registers to 1812 gives George Wanless’ age at death as 10 months. He died 27 August 1809, so he would have been born in 1808.
The NDFHS won't have films of the original registers, if your aim is to double check the age of death for George. If no-one is able to do a look up for you at Woodhorn, you can order films of Lesbury parish registers via
www.familysearch.org (see the online film catalogue) to view at your nearest LDS family history centres. There is almost certainly one of these in the nearest large urban centres (again, check the list of locations on family search).
Not sure if you already have the following but there is a marriage in Lesbury parish, 26 April 1803, for a Thomas Wanless & Isabella Ferguson, both of this parish, witnesses John Dixon & Joseph Moore.
The only baptism that I can see for this couple is that for Isabella, born 8 July 1803, baptised 10 October 1803, 3rd daughter of Thomas Wanless, Shepherd, Lesbury by his wife Isabella daughter of Wm Ferguson, Little Houghton.
Something possibly a little belated about that marriage, unless Thomas was married previously & Isabella is his 3rd daughter but perhaps the first child of Thomas' marriage to Isabella Ferguson.
Have you checked surviving records of nearby non-conformist congregations for the baptisms of George & Ann Wanless/Wanlass & variants? & Scotlandspeople?
Good luck.