I did find a written record off a tombstone in USA for Thomas age 91y 1d, d 5/8/1849. Also a birth record for Thomas Shimmin on LDS as German...Parents Nicholas Shimmin & Margery Creer

The Tombstone record for Ann Kinsman is d 4/12/1876 at age of 64y 6m 6d which would make her rather young to be married to Thomas? Closet I could find on LDS for Ann was a c date of 1/16/1814 from Cornwall England, Parents William Kinsman & Elizabeth ?

The area where they settled in USA has quite a few people from Isle of Man & England.