Here we go again......

I have William Hankins,.. father of Richard Hankins,.. who is father of John Hankins Bartestree. now.. William is married to Mary ?.. William died in 5 oct 1833..Weston Beggard..late of The Pidgeon House..(these dates are on the photo of the tombs in church grounds)
he was 65 years when he died..take that off death date, and we have born in 1768...now...
Mary, his wife ? born in 1735..Weston Beggard..died on 17 Apr. 1798 aged 63..which makes her born in 1735...which..by this makes him 33 yrs older than her....am I right?? The tomb of Mary confirms her dates as mine....what?, who? and How? Help...!!