Dennis A Callahan age: 38 Related to:Sean Callahan, 29 Ayla Callahan, 36 Has lived in:Waltham, MA Dedham, MA Narragansett, RI Dennis J Callahan age: 88 Known as: Denny J Callahan Dennis J Casllahan Related to:Dennis Callahan Has lived in:Waltham, MA North Waltham, MA Arlington, MA Dennis R Callahan age: 79 Known as: Denny R Callahan Dennis R Callanan Related to:Daniel Callahan Has lived in:Northborough, MA The Villages, FL Maynard, MA Waltham, MA