Hi Len,
The original death record image, it is indeed very clear (can be accessed via the settlers website link too). What a lovely face he has, very kindly looking!
By the precise statement on the death notice , that he was aged 75 years, two months and 17 days at the time of his death on 28th April 1862, we can deduce he was born on or about, 11 February 1787.
However, my original comment stands - the death notice states his parents to be John and Sarah, not Benjamin and Sarah. The informant is a son in law.
The 8 March 1787 Baptism of Benjamin BOOTH in Richmond Surrey , says the father of that child is named Benjamin, not John. If the Baptism also included the child's date of birth and it was a match to your man, we could immediately surmise the son-in-law was in error - but the baptism does not record the birthdate.
The 8th March Baptism is agreeable to a birth on ~11th February, the place of Baptism is agreeable to the place of Birth recorded on the Death notice (Richmond Surrey). The mother's fore name is agreeable.....
....and chances are, the baptism is correct, the son-in-law was wrong - based on typical presumption that death information is often incorrect. But maybe the baptism is wrong....
....There are a number of baptisms at the same church in Richmond 1783 through to 1794, with parents John & Sarah BOOTH. But only the one in the same rough time frame, with parents Benjamin & Sarah BOOTH.
The other thing is, didn't always occur close to birth, they could be months or even years later, and if he wasn't regular C of E (though he probably was), that's a whole other kettle of fish.
He married Margaret Mortimer 1809 in Surrey and they had 7 children (3 in England , 4 in SA). None of the children were named John, but there is a daughter named Sarah. Margaret his wife, died 1847.
In 1854 Benjamin remarried to a Grace BRENT, maiden name ELLIOT at Mt Pleasant, Bathurst District, Eastern Cape, South Africa.
Does the 1854 marriage state parents names?
Cheers
AMBLY