I have never researched this, but it is not surprising. I imagine may of these men had same-sex attractions when young, but never did anything about them because it was not socially acceptable. They dated women, got married and had kids. Maybe they waited for the kids to grow and move out of the house or wait to get get divorced or they ended up widowers. At that point, then then let their same-sex curiosity resurface. Some act on it and some do not.