Actually, if the apple sauce is home canned appropriately I can testify it will have a shelf life of up to 5 years. A water bath in boiling water with the sealed jars covered with at least 1 inch of water 20 minutes or more will do the trick… really pretty easy. Here in the U.S., we make applesauce and apple butter along with home canned sliced apples for pies nearly every fall and have never had a batch go bad.
Some of our jars are 20 years old, but, of course we never reuse jar lids, just the rings. The lids popping at night after sealing are a welcome sound for a new batch of home canned goods…
By the way, the 6 months estimate is accurate for non-sealed and refrigerated applesauce...