Hi: This speaks volumes to me.The pre-flood warning was preached to 4 generations: Those of Enoch, Methuselah,
Lamech,and Noah. Enoch had to know about the flood because he named his son Methuselah which means "when he is dead it [the flood] shall come". Enoch did not see death because he was translated to heaven at the age of 365. Methuselah died on the 'very year' of the flood at the age of 969. Lamech died 'before' the flood at the age of 777. Noah died after the flood at the age of 950.
It is my understanding that Lamech died 5 years "before the flood".Lamech and Mechusalah died near the end of that age,at the time this earth was flooded. Lamech died before Mechusalah,so Methuselah must have known that Lamech was 777 years old at the time of his death. My feeling is that Mechusalah must have pondered the numbers 777 because I would have. The Lord Jesus used the numbers 777 at the very end of that age,the very last days "before" the time of flood.Now here we are again at the very end of this age with the same numbers 777.Do you think this is a coincidence? As it was in the days of Noah we have these 777 numbers appearing again. I will give this some further thought.