Yes, the explanation is buried in notes on his profile overview
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Adventurers of Purse and Person 1607 - 1624/5 and Their Families" published by the Order of First Families of Virginia, indicates in a footnote (pp. 419-420) the discrepancy between the dates inscribed on his Grace Church tablets and the filing of the wills for George Read and his wife Elizabeth as follows: "His and his wife's gravestones were discovered during street excavations in Yorktown in 1931. The inscriptions on both were recut with errors. George Reade's stone now states he died Oct. 1674, "he being in the 66th yr of his age." Since the date should be 1671 (per his will), either the age shown, or his year of birth, is in error as well....The gravestone of Elizabeth (Martiau) Read now states she was born in 1625 and died in 1696, "being in ye 71st yeare of her age." Since the year of death should be 1686 (per her will), again the age or year of birth is in error. Since Nicholas Martiau claimed...his daughter Elizabeth as headrights...it would appear Elizabeth was born prior to his arrival in Virginia in 1620...and that Elizabeth's birth occurred in 1615 rather than 1625."Birth: 1625 Ancestor of George Washington .Also descended from the Reades were Robert E Lee and Thomas Nelson (a signer of the Declaration of Independence). "From what I have read, the death date engraved on his stone is incorrect. The gravestone was re-cut after it was discovered in 1931. He actually died 21 Nov 1671, not Oct 1674." S.R.F.