Here are some gravestones with partial or almost complete loss of the inscriptions. That are 100 to 112 years old:
1910 gravestone - 100 years old
www.findagrave.com...
S and A in Samuel are almost gone. Much of the information on his Civil War service is gone.
1900 gravestone - 110 years old
www.findagrave.com...
The year of birth and year of death are almost unreadable.
1912 gravestone - 108 years old
www.findagrave.com...
At the present time, the day of birth and day of death are completely unreadable. The remainder of the inscription is almost unreadable.
1908 gravestone - 112 years old
www.findagrave.com...
Day of birth is completely gone.
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The following gravestone is only 110 years old and it is just about completely gone. The only thing that "saved me" in being able to figure out who
he was came from information on a family tree on the Internet and an old cemetery report.
1900 gravestone - 110 years old
www.findagrave.com...
Here is what I put in his bio on his memorial on Findagrave.com:
"His middle name and information on his dates of birth and death are from the "hawksdomain" family tree on WorldConnect.
As you can see in the photos, all of the dates of birth and death have been weathered off this stone. We are fortunate that we can still see his
middle initial, plus a portion of "Charles." When I originally read this stone at the gravesite I could only see "Charles E." and "VANTINE."
The 2003 Pleasant Hill Cemetery report lists him as "Charles, no dates" son of James M. and Adaline (BIRCH) VANTINE."
So the life of the inscriptions on marble gravestones is NOT 200 years. At 100-112 years the inscriptions are already being lost.