Different people value different qualitys in people maybe the people her age can't provide the qualitys she's looking for? A man of 50 who's a businessman may want a younger wife and can provide stability for a family life a house and means to bring up a child. The only worry I'd have with age range 50-70 is if the guy was over 60 it's unlikely he will see his children grow up and she may end up a widow however the future would be set up for wife and kids. We all have a right to choose who we want