Thanks Scott and Jen!
I believe Sarah may have been born in 1635, because of a record I found that may have been for her but could have been transcribed wrong. I wrote about that in the last paragraph of "children".. Obviously, that is not a definitive answer, but since the whole profile was built on conjectures supported by a lot of research and primary sources, but still we can't really be sure of any of it, I thought it was worth putting those ideas out there.
Unless we find more primary sources that place them earlier in the Colony, the date for their arrival will have to remain somewhere between 1636 and 1640. Which is not bad, but I'd love to find them on a passenger list!