One of the great strengths of working within Geni is the power it has to match records. Since my last note at 2:50 am, Geni has proposed a number of My Heritage matches which suggest @Jacob Silliker was born in New Rochelle, NY in 1750 which sits better with @George Silliker being born in 1733.
My tactic in such cases is to post the most reasonable estimate and continue to research for a more acceptable solution.