Hi
As Thomas died before 1851 we don't know his exact age, he was not buried at Stoke Lyne and I don't have the Ardley transcripts which probably covered Fewcott to check his age given at death.
In 1841 the family are in Stoke Lyne - there is an elder daughter Keziah aged 9, Thomas's age is given as 30.
I checked through the baptisms at Stoke Lyne, the only Thomas I could find 1800-1820 was baptised 1805 Feb 11th s/o Thomas & Ann Keen.
There is a marriage at Bicester 13th October 1788 of Thomas Keen of Stoke Lyne to Ann Matson.

DebbieG