Depends on the individual, I know people who change mid-life to the point it's hard to recognize them (my mother being one of them - changed almost everything about her lifestyle when we left home). Change can happen any time.
Also, the stats on age are slightly sked - they look to see who makes it to their 30th anniversary. Someone who marries at 45 is far more likely to be separated by death than divorce before their 30th anniversary compared to someone who marries at 25, which the NOS recognises.
I think it has more to do with personality, expectations, and stress than it does sex, gender, or age. While many do work, second marriages are more likely to fail than first, third even more so, and so on. Though divorce rates are getting lower, 60% still last at least 20 years, and it's questionable whether divorce is really a problem. Generally, good relationship skills and expectations are far more important determiners than an age, some people will never have either no matter how old they get.
The money thing/stress is interesting though. All my father's divorces (4) were really about money, because he has horrible expectations around it and has never learned how to communicate or learned how not run up debt.