Why are you looking at how long they lived and subtracting? The Bible already gives you the lengths after the next in line is born and the remainders along with the totals. Who subtracts from death to give time frames?
If you did the math properly, you can see the time since the fall. Mathusala lived the longest, but died the year of the Flood. It is not algebra, and you do not need to subtract and add. Just add the time between births. Unless you can show a chart from a source that proves your point. There are a lot of online charts from many sources that show the timeline.
Noah was 600 years old when the Flood came. His dad already died 12 years before. You cannot add 345 years to time that does not exist when Enoch left early. That is fuzzy math. Enoch left about a year after Adam died, if your math is right. You claim it was almost 1000 years after Adam died.
OK I went back and re-crunched the numbers.
930 = Adam's life span.
130 years in Seth is born.
930 - 130 = 800 from Seth's birth to Adam's death.
912 = Seth's life span.
912 - 800 = 112 years Seth lived passed Adam.
930 + 112 =
1042 years have passed.
105 years into Seth's life Enos is "born".
(Actually the ancestor to Enos was born. Enos was born the same year Seth died. But to prove the point; I'll use your assertion.)
912 - 105 = 807 years from Enos's birth to Seth's death.
905 - 807 = 98 years Enos lived past Seth
1042 + 98 =
1140 years have passed.
905 = Enos's life span.
90 years into Enos's life Cainan in born.
905 - 90 = 815 years from Cainan's birth to Enos's death
905 - 815 = 90 years Cainan lived past Enos.
1140 + 90 =
1230 years have passed.
910 = Cainan's life span.
70 years into Cainan's life Mahalaleel is born.
910 - 70 = 840 from Mahalaleel's birth to Cainan's death.
Mahalaleel lived 895 years.
895 - 840 = 55 years Mahalaleel lived past Cainan
1230 + 55 =
1285 years have passed.
895 = Mahalaleel's life span.
65 years into Mahalaleel's life span Jered is born.
895 - 65 = 830 years from Jared's birth to Mahalaleel's death.
Jared lived 962 years
962 - 830 = 132 years Jered lived past Mahalaleel.
1285 + 132 =
1417 years have passed.
962 = Jared's life span.
162 years into Jared's life span Enoch is born.
962 - 162 = 800 Years from Enoch's birth to Jered's death.
Enoch lived 365 years.
So Enoch's father outlived him by 435 years.
(My first error was adding 435 to 1417 because 1417 was still the year Jered died.)
Still 1417 years have passed.
65 years into Enoch's life Methuselah is born.
969 years Methuselah lives.
365 - 65 = 300 years into Methuselah's life Enoch "dies".
969 - 300 = 669 years Methuselah outlives his father Enoch.
669 - 435 = 234 Methuselah outlives his grandfather Jared.
1417 + 234 =
1651 years have passed.
969 = Methuselah's life span.
187 into Methuselah's life is Lamech born.
969 - 187 = 782 years from Lamech's birth to Methuselah's death.
Lamech lives 777 years.
Methuselah outlives his son Lamech by 5 years.
1651 years have still passed since Methuselah dies.
777 = Lamech's life span.
182 years into Lamech's life is Noah born.
777 - 182 = 595
(Second mistake. 500 years till Shem Ham and Japheth are born; not 500 years to the flood.)
600 years from Noah's birth to the flood.
1651 + 5 =
1656 years have passed from creation to the flood.
Yet according to your date for the flood (1626) Scripture clearly says Methuselah is 969 years old when he dies; which means if the flood really was in 1626, then Methuselah survives the flood by 30 years which is impossible because he wasn't on the ark.
So...... ???????
AND - According to Genesis, Abraham is still another 10 generations away! According to Luke; another 11 generations away!
So let's go on:
When Noah lived 350 years after the flood. The flood ended when Noah was 600 years old. (Genesis 7:6) It took him 120 years to build the ark. So Noah was 950 years old when he died.
Shem was 98 years old at the end of the flood.
Arphaxad was born 2 years after the flood.
Shem lives for another 500 years which makes him 600 years old.
Noah was 502 years old when Shem was born.
By the time Noah is 500 years old, he has Shem, Ham and Japheth.
Ham was probably born when Noah was 500 years old.
Genesis 9:24 says Ham was the youngest. Japheth is the oldest. Scripture does not record how old Japheth or Ham were when they died.
Arphaxad who is Shem's son is 438 when he dies. (Genesis 11:10)
Shem is 100 years old when Arphaxad is born two years after the flood. (vs 10)
Shem lives 500 years after Arphaxad is born. (vs 11)
Shem outlives Arphaxad by 60 years.
Shem dies 502 years after the flood.
Arphaxad is 35 years old when Salah is born. (vs 12)
Shem is 135 years old when Salah is born
Salah lives 433 years (Ad vs 12 to vs 15)
500 - 135 = 365 years Shem lives after Salah is born.
433 - 365 = 68 years Salah lives past Shem.
Salah dies 600 years after the flood.
Salah is 30 when Ebner is born.
Salah lives 398 years after Ebner is born.
Ebner lives 464 years.
464 - 398 = 66 years Ebner lives past Salah.
Ebner dies 666 years past the flood.
1656 + 666 = 2322 years have passed since creation.
Peleg is born when Ebner is 34 years old.
Peleg lives 320 years.
Ebner lives 464 years.
Ebner outlives his son Peleg by 110 years.
Reu is born when Peleg is 30 years old.
Reu lives 239 years.
Peleg lives 320 years
320 - 30 = 290 years Peleg lives after Reu is born.
Peleg outlives his son Reu by 51 years.
Ebner outlives his grandson Reu by 59 years.
Reu is 32 when Seru is born.
Seru lives 230 years.
239 - 32 = 207 years Rue lives after Seru is born.
Seru outlives Rue by 23 years.
Ebner now has outlived his great grandson Seru by 36 years.
Seru is 30 years old when Nahor is born.
Nahor lives 148 years.
Seru at this point has outlived Nahor by 52 years.
Ebner now has outlived his great great grandson Nahor by 88 years.
Nahor is 29 years old when Tarah is born.
Tarah lives 205 years.
Terah outlives his father Nahor by 86 years.
Ebner at this point has outlives his great great great grandson Terah by 2 years.
Tarah is 70 by the time Abraham, Nahor and Haran are born. (vs 27)
The text says Tarah outlived his son Haran. This is the first place where the text says a father outlives a son. Yet we have this great great great grandfather that's outlived 4 other generations?
205 - 70 = 135 years Abraham has lived until Tarah dies.
Abraham lives to be 175.
175 - 135 = 40 years Abraham lives past Tarah.
2322 + 40 = 2362 years (allegedly) since creation.
Obviously something is wrong with the timeline though if you have Methuselah dying 30 years after the flood is over.
Ebner outlives 4 other generations and the text doesn't mention that? Nor does the text mention Methuselah outlives all these other generations too; yet it says Terah outlives Haran?
Then there is an extra "Cainan" in the genealogy in Luke that does not exist in Genesis.
So how do you make it all "jive"? The only way you can is line the patriarchs ages up end to end unless the text tells you its a direct father son relationship by "and called his name".