Query on Caroline NICHOLS

Tasmania Marriage Records - James BELBIN age 20 married Caroline NICHOLS age 20 married on 2/2/1824 at Hobart
(therefore born c1804)

Tasmania Death Records - Caroline BELBIN died 7/5/1854 Hobart, age 56 (therefore born c1798)

https://vincefehrefamily.wordpress.com/william-nichols/

By the middle of 1802 William and Fanny had four children, another child having died as a baby. By then they lived in Wych Street, in St Clement Danes, but they had originally lived in Mile End and Whitechapel.

In July 1802 William wrote to Sir Joseph Banks, requesting information about migrating to Australia. In August he wrote a similar letter to Lord Hobart. In January 1803 he wrote again, this time to Lord Melville, via his secretary William Budge. He mentions that in the six months since his first letter he has “Buried one Child”. This would be Caroline, who died in November 1802.