My father has every National Geographic magazine since the late 40s - in your op!
Question:
My father has every National Geographic magazine since the late 40s - in your opinion,are they worth anything?
Answers:
There are collectors of just about everything. Including old National Geographic Magazines. Finding a collector though, might mean a little effort and possibly advertising the fact you got 'em.
Whether they are worth anything will depend on their condition and how bad the collector wants them.