Hi Mike
Virtually all of Beds parish records pre 1812 have been extracted onto the IGI at
www.familysearch.org. There are no Pearces in Wrestlingworth, so either they were not baptised or they were from another parish.
The 1851 census is the first to give birthplace:
HO107/1753 folio 263A
Wrsetlingworth
David Pearce head married 50 Farm lab born Morden Cambs
Elizabeth Pearce wife 59 b Hatley Beds (Hatley St George is in Cambs, but Cockayne Hatley is in Beds)
Catherine Pearce dau unmarr 19 b Wrestlingworth
If you go to the Cambs FHS website at
http://www.cfhs.org.uk/Search.html you can consult the baptism index which will tell you David's parents, but you'd need to check the parish register to get the full entry.
David is shown as age 35 in 1841 but ages over 15 were rounded down to the nearest 5 below so he could have been aged between 35 and 39.
I can't see a marriage on the IGI but Cockayne Hatley only goes up to 1812, so you'll need to check the parish register as I suspect that's where the marriage might have taken place
Regards
David