What may make it hard for them is changing a long lifetime of habitually bad eating habits, but it could be done in stages if it seems easier. I don't see how it could be dangerous to clean up your diet at any point in your life.

I wish my mother was still alive so I could tell her about low-carbing. She died 4 years ago at 64 of a heart attack. I am the same carb-addict that she was.

Karen