Router/chisel out the doors so that the "hole" is uniform. Glue in some oversized pine using PVA and cramps. Plane flush, then fit hinges.
The glued timber, if done correctly, will be at least as strong as the original.
Best advice from dug. Removing a hinge is the first step on the inevitable path of buying a new pre hung door.
@davidual started
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Router/chisel out the doors so that the "hole" is uniform.
Glue in some oversized pine using PVA and cramps.
Plane flush, then fit hinges.
The glued timber, if done correctly, will be at least as strong as the original.