Roger D. Joslyn, "Rebecca, Wife of Thomas Josselyn of Hingham and Lancaster, Massachusetts," NEHGR Vol. 158, October 2004, p 330-340

From footnote 3:

In the original list (1635 London Port Book, The National Archives [formerly the Public Record Office] E157/20, p 17), dated 17 April 1635, the name was written as Jostlin: a Husbandman--Tho: Jostlin -- 43, Rebeca his wife -- 43; Rebecca -- 18; Dorothy -- 11, Nathaniell -- 08, Eliza -- 6, Mary -- 1, children of the family [of] Thos. Jostlin; Eliza Ward, maid servant, 38. My thanks to Robert C. Anderson for a copy of the original list.

From pages 330-331:

When in April 1635 the Josselyns enrolled to sail from London to Boston aboard the Increase, Rebecca was listed as 43, the only known record of her age. Following the family's arrival in New England, the next discovered mention of her is 9 May 1660, when in his will, Thomas "Joslin" of Lancaster bequeathed to "my wife Rebecca Joslin" for the rest of her life, "all my goods, moveables & all my estate & housing with barne & cow houses" in Lancaster, as well as "all debts that be oweing to mee either in this Towne of Lanchaster or elsewhere, wahtsoever with all lawfull power to recover them." Rebecca was to have "so much of my goodes and lands as shall remayne undisposed for her comfortable maintenance & subsistance in mann[er] herafter following," and she to be "whole and sole Executor, dureing the time of her life."