[MENTION=90220]JLB[/MENTION] 's assertion that a generation is always 40yrs is easily disproven from scripture. Of those two other 14 generation periods, from Abraham to David, and from David to the Babylonian captivity, neither are 560yrs. Clearly the assertion that a generation must be 40yrs is, in fact, wrong.
I see you chose option 1, which is expected.
Please "disprove" that a generation is not 40 years as stated in Matthew 1:17.
17 So all the generations from Abraham to David are fourteen generations, from David until the captivity in Babylon are fourteen generations, and from the captivity in Babylon until the Christ are fourteen generations. Matthew 1:17
Read Matthew 1:17 again. It does not say a generation is 40yrs, and it does not say 14 generations are 560yrs. The word 'year' doesn't even appear in the verse.
To scripturally prove within this context that 14 generations does not equal 560yrs is easy:
From Abraham to David are fourteen generations - Mat 1:17
Abraham died at 175yrs old - Gen 25:7
Abraham had Isaac at 100yrs old - Gen 21:5
Isaac had Jacob at 60yrs old - Gen 25:26
Jacob entered Egypt at 130yrs old - Gen 47:9
Therefore, Jacob entered Egypt 115yrs after Abraham died
Therefore, Jacob entered Egypt 290yrs after Abraham was born
Jacob/Israel was in Egypt 430yrs - Exd 12:40
Therefore, Israel left Egypt 545yrs after Abraham died
Therefore, Israel left Egypt 720yrs after Abraham was born
David began to reign at 30yrs old - 2Sa 5:4
David reigned 40yrs - 2Sa 5:4
Solomon's 4th year of reign was the 480th since Israel left Egypt - 1Ki 6:1
Therefore, David was born 406yrs after Israel left Egypt
Therefore, David died 476yrs after Israel left Egypt
Therefore, there are 951yrs from Abraham's death until David's birth (14gen Min)
Therefore, there are 1196yrs from Abraham's birth until David's death (14gen Max)
Therefore, the 14 generations from Abraham to David would each average 67.93yrs minimum and 85.43yrs maximum