You should only freeze films that are in their unopened original packing -
plastic cans for 35mm (might be metal for HIE) or foil wraps for 120.
This ensures you don't have a problem with condensation.  That's the
party line - I've successfully frozen 35mm that's been opened, but not
on humid days.

As far as life, I can offer only an anecdote.  A few years ago I needed
a roll of 120 Tri-X to test a recently-acquired camera.  The only film in
the freezer had an expiration date of 1974, this was stuff I used when
in high school, I used to respool it for my Kodak Reflex (took 620).
It had been frozen continuously since purchase, about 20 years.
The film was slightly fogged but certainly usable and I actually got a
couple of very nice display prints from that "test" roll.  Had to use a
fairly high contrast setting to print them, though - 3.5 I think.

Steve

A couple of years ago I inherited several rolls of B&W film that had been
refrigerated, not frozen.  Expiration dates were from the mid 80's to mid
90's.

Tri-X, Plus-X, and Pan-F were all fine - I really could not see any
difference between these old rolls and fresh film.

I had a couple of rolls of Tech Pan that I developed in D19 - it seemed to
be OK but no telling what it would have looked like in Technidol.

HIE IR however was no good - it was 15 years out of date though.  There was
some IR effect, but the film was very foggy.

Pan Atomic-X developed nicely and looked good, but little bits of the
emulsion fell off so I had lots of spots on the frames. After the first roll
I was careful to not use a stop bath and be as gentle as possible in
development, but it still dropped chunks of the emulsion.

HTH -

MCC