The marriage according to famiylsearch.org says
Daniel Gardner -  love Furnifer 6th March 1769 Tenterden Kent
Which would make Daniel aged 21 sounds better 

There were  a family of Gardner who were travellers married into Lane/Smith/Warne that were travellers around the Surrey and Kent areas.
Mitcham Surrey seemed to be a favourite place for families
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 Not sure if any help but found this
1841 there is a Love Gardner b 1766 Gloucestershire living with a family
 in Keynsham Sound well Mangotsfield
 Other people listed
BRACEY, Hannah F 70 1771  Gloucestershire  
BRACEY, Ann F 50 1791  Gloucestershire    
BRACEY, Elizabeth F 30 1811  Gloucestershire   
BRACEY, Eliza F 8 1833  Gloucestershire    
BRACEY, John M 5 1836  Gloucestershire