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How to prune old apple trees 
Make sure that the tree is healthy. 
Pruning an old apple tree can encourage it to develop new growth and fruit. If the tree is brittle, dead, or diseased, then pruning it won't help.
Pick from: [i] Mature trees should be pruned at least twice a year. Older trees should be pruned every two years.. [ii] To minimize damage to the tree as you prune, it's a good idea to prune it at least once a month, or every couple of years. Only prune overly old or brittle apple trees, as these types of trees usually suffer damage from harsh pruners.. [iii] Pruning a healthy older apple tree may end up splitting the tree down the middle. Clean the tree and inspect the tips for split or damage, which is a disease that most trees have.. [iv] To determine whether or not your tree is worth saving, look for the following : Grayish or crinkled branches: these branches are dead or diseased. If more than half of the tree's branches appear like this, then the tree is not worth saving..
[iv]