!BIRTH Census 1787 Linå, Gjern, Skanderborg, Danmark lists his age as 44 (Dansk Rigsarkiv, Dansk Demografisk Database)(Dansk Rigsarkiv, Arkivalieronline, Linå Sogn, p. 54 n. 9 (p 3/22).

!BIRTH Census 1801 Ellerup, Gjern, Gjern, Skanderborg, Danmark lists age as 58 (Dansk Rigsarkiv, Dansk Demografisk Database)(Dansk Rigsarkiv, Arkivalieronline, Gjern Sogn 25-40, p 11/17, n. 1).
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This was the only family with a Peder Laursen Bastrup (of the right age) that I could find on the 1787 census in Skanderborg, which is where Peder Laursen Bastrup (L 30/31) reported himself as being born in the 1845 Census (Horn, Tvilum)

There is, however, a Peder Laursen, age 1 in 1787, also living in Lauen, Linå, Gjern, parents Lauritz Rasmusen and Anne Andersdatter. You would have to wonder, though, why our Peder would pick up the surname Bastrup if he was from this family. Our Peder is referred to as Bastrup on all adult census documents as well as in all the christening records of his children.