Hi
The 1841 census yes or no question about birth is born in or out of county. Richard says no so if that is correct he wasn't born in Warwickshire. Richard's age on the 1841 census was given as 65. Adult ages on the 1841 census, those over 15 were usually given to the nearest 5 below the actual age, so again if Richard is accurate with his age it could be anywhere between 65-69. His burial record or death certificate would give a more accurate age. Richard gives his occupation as shoemaker. Ann aged '55' gives her birthplace as Ireland or since it is only a capital letter that denotes birthplace it could be an S for Scotland.
There is this Ann Fowler on the 1851 census who might be the same woman
1851 census HO107 2055 folio 230
31 Howard Place Birmingham
Michael Casey 37 Head Married Bricklayers labourer Ireland 
Martha Casey 31 Wife Married Birmingham Warwickshire 
Sarah Casey 8 Daughter Birmingham Warwickshire 
James Casey 6 Son Birmingham Warwickshire 
Martha Casey 4 Daughter Birmingham Warwickshire 
Henry Casey 3 Son Birmingham Warwickshire 
Emma Casey 6 Months Daughter Birmingham Warwickshire 
Ann Fowler 67 Mother Widow Receiving parish relief Ireland
MICHAEL CASEY  
MARTHA BUCKLEY  
Marriage:  11 APR 1842   Saint Martin, Birmingham, Warwick
Just a stab at this but shoemaking was a quite common occupation for ex soldiers particularly those that had been wounded and wives who were born in Ireland might indicate that was where they met, in which case again that might be because Richard Fowler was a soldier at one time. His death certificate may or may not give further information. Of course many people arrived from Ireland and lived in Birmingham and many shoemakers had absolutely no connection with soldiering so it is only an option to consider.
Are these also children of Richard and Ann? What occupation in the baptism register is given for their father?
RICHD FOWLER  
Birth:  10 FEB 1820    
Christening:  26 MAY 1821   Aston Juxta Birmingham, Warwick
Father:  RICHD FOWLER  
Mother:  ANN  
THOS FOWLER  
Birth:  05 FEB 1821    
Christening:  26 MAY 1821   Aston Juxta Birmingham, Warwick
Father:  RICHD FOWLER  
Mother:  ANN  
ANN FOWLER 
Birth:  31 MAY 1822    
Christening:  JUN 1822   Aston Juxta Birmingham, Warwick
Father:  RICHARD FOWLER   
Mother:  ANN     
Regards
Valda