The Genealogy of Adam

"This is the book of the genealogy of Adam..."
-Genesis 5:1[NKJV]

I've often wondered how many of his great grand children Adam saw. A detailed study puts all into perspective. The following information was gleaned from the book of Genesis from chapters 5-7. Here goes...

Adam lived a long time. He saw his grand children till about the 8th generation. This excludes Cain and Abel. The official reckoning begins from Seth.

Seth was born when Adam was 130 years old.
Enos(h) was born when Adam was 235
Cainan (Kenan) was born when Adam was 325
Mahalaleel was born when Adam was 395
Jared was born when Adam was 460
Enoch was born when Adam was 622
Methuselah was born when Adam was 687
Lamech was born when Adam was 874
Just imagine the beauty of it. Several generations of gray haired men alive at the same time, each seeing their father(s) and son(s).
Adam saw his children to the 8th generation.

Adam died at the age of 930. At this point,
Seth was 800 years old
Enos was 695
Cainan was 605
Mahalaleel was 535
Jared was 470
Enoch was 308
Methuselah was 243
Lamech was aged 56 as at then (small boy, lol).
When Lamech was 113 years old, Enoch was taken (this was 57 years after Adam had died). I try to imagine the shock and commotion his disappearance caused.

Lamech was the father of Noah.

Noah was born when Lamech was 182 years old (this was 126 years after Adam died and 69 years after Enoch was taken). He didn't meet Adam and Enoch, he only heard stories of them. He met the rest of his ancestors.
By the time Noah was 500 years old, he had borne three sons who had married wives. This was the point at which he received the mandate to build an Ark because of the wickedness in the world. He spent 100 years in building it.
I wonder what Methuselah and Lamech thought about him as he laboured away day in day out.

Non of the ancestors witnessed the flood.
Adam died 669 years before the flood
Enoch left 612 years before the flood
Seth died 557 years before the flood
Enos died 459 years before the flood
Cainan died 364 years before the flood
Mahalaleel died 309 years before the flood
Jared died 177 years before the flood
Lamech died 5 years before the flood
Methuselah died in the year the flood came, when Noah was 600 years old.