Again, I'm just relying on other people's perhaps dubious research that I took at face value at the time...but now am not all that sure, for obvious reasons. Never hurts to air on the side of caution in this business anyway...and it's slightly embarrasing that I'd fallen into quite an obvious error all those years ago, but I digress.
George Griggs is quite a frustrating gentleman, and naturally an age at death would have helped everyone quite a lot there! Also a little frustrating, given that the registers only a decade later in St. Lawrence record so much more detail compared to many other parishes at the time...always nice to have cause of death a regular occurance, even if for only a few years. But anyway, it is interesting to note that there is a burial for a George Griggs in St. Lawrence on 25th March 1784...aged 39-years, giving a birth date of c.1744/45. Presumably this is the 1744 George you spoke of, which at least could suggest he survived long enough to father the children in question. The registers note him as having died of a broken thigh, which is interesting. Maybe, though, this could suggest that the 1764 burial is for the earlier 1735 George?