Dennis B Costin age: 71 Known as: Denny B Costin Costin Denny Related to:Shawna Irwin, 49 Has lived in:Boston, MA South Boston, MA Everett, MA Dennis B Costin age: 40 Related to:Bart Costin, 98 Has lived in:Boston, MA South Boston, MA Coconut Creek, FL Deerfield Beach, FL