To answer another question, the OM is 25, single, and never married. 3 years younger than my wife, and 4 years younger than me.
I would also agree that the age we started our relationship likely has been a factor. Bad, non-productive habits were definitely formed by both her and I, and unfortunately were not addresses or broken even as we've grown and matured over our relationship.
M: 29, W: 28 Together 8 years, Married 1 (5/16/09) Bomb (LYBNILWY)4/22/10 Affair discovered 5/3/10, began Jan/Feb 2010 Separated 5/22/10 - Present Affair exposed 7/7/10 No children