Question

If Simon Casparse Springsteen died in 1757, how could he be the father of John Springsteen, born in 1759?

Answer 1

The sources do not really provide evidence for either one of these dates, except, perhaps, the ambiguous "Ancestry Family Trees."

Answer 2

It is the wrong John Springsteen.  Besides the problem of his birth in New Jersey, not New York I found the following reference:

Ancestry has the book "Early Settlers of Bushwick, Long Island and their descendants" on line.  According to that book, the John Springsteen that was the son of Simon Casparse Springsteen (b. 1709) and Maria Sager was born 1752/1753, he married a Leah unknown, was on the 1790 census at Watervliet, and had two probable children, Simon b. 10 September 1776 and Maria, b. 1777.    There is a note that Mr. Schemerhorn reports two others on the 1790 census,  John Springsteel and Jacob Springsteel that are living in Harpersfield N.Y. and seem to be more likely related to the Springsteels of the Mohawk Valley as yet unidentified.   But not New Jersey.   I skimmed the book for any Springsteens that might have moved to New Jersey, but did not find any.  The book concentrates on New York.   But I just skimmed.

If you have ancestry sub:  https://www.ancestry.com/interactive/19028/dvm_LocHist005652-00312-0?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.aspx%3fdbid%3d19028%26path%3d&ssrc=&backlabel=ReturnBrowsing#?imageId=dvm_LocHist005652-00363-0