Age and Divorce: They say Billy Joel's wife Katie Lee thought he was too old

I was just reading on the Post that there are rumors that Katie thought Billy was too old-headed. She is about 27? And He is about 60? And she wanted to party and he wanted to stay home and look at his antique motorcycles. Apparently.
Got me to thinking about age and divorce. Does a massive age difference pre-dispose one to divorce? I think so. It is a form of “uneven yoking” that I have discussed ad nauseum on this blog. How much of an age difference is healthy? I say no more than 10 years assuming that the older spouse is very “young at heart.” And the younger spouse is very mature. Anything more than that is asking for divorce. Big time.