Going back to my original post we know John Hess married Mary Quinn 1867 it says full age usually reckoning on John being 20 when he married, so is this the John who died in Wexford in 1899 age 48 birth c 1851??
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Full age in Ireland was until relatively recently considered to be 21 years. So to claim full age you had to be
at least 21 years.
So looking at a marriage in 1867 full age would mean a person being born at least 21 years before. So in this case 1846. So the John who died in Wexford with a possible birthdate of 1851 can really only be considered a might be/possibly be at this stage.
You can do more checking by looking at birth certificates of children, marriage certificates possibly, death certificates of children, wife or close relaaltives so you can work out when he was last carrying out these civil duties. You can look at the death certificates to see what he and relatives died from.
Pthsisis Phthisis or TB can kill regardless of age, also influenza/bronchitis. If he died from TB and children or close relatives also died around then then this may be a good find. Also check to see who reported the death.
On the other side of this we know that back in those days with low literacy levels etc that birthdays etc were not considered as important to celebrate as nowadays. This all changed when the Old Age Pensions came in and there was a scramble to establish births by searches of baptisms and by looking at what are now census fragments.