How do I repair 50+ year old slab doors which are broken?

I want a clean, Scandinavian look to go with the modern kitchen, bath and white paint through most of the house. No county looks or fancy moulding suggestions. If I have to buy new ones, I will, but I could put in some work. No busy looks either as there are 2 closet doors, 3 bedrooms and 1 bathroom all off one small upstairs landing.

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