I have let two apple trees grow for a few years without pruning and they are now so high that I probably should have someone else prune them. SWMBO certainly thinks so. I don't ask for recommendations as to specific people or companies, which I think are not allowed here anyway, but is this something for which I want an arborist? A horticulturalst? A regular lawn-maintenance company?
Probably 18-20' tall to the top of the highest branch but I would prefer to have them end up no more than, say, 12' tall.
If that much top growth is removed in one pruning, any parts of the trunk and main branches that become exposed to the sun should be protected with white latex paint or something similar. Removing smaller amounts each year over several years may avoid problems with sunscald.
My rule of thumb for pruning any tree in my garden is 20% only at a time. Perhaps a little more in February. So if it is that big, as vitog suggests, perhaps carry this out over a couple of years.
Older apple trees that are well beyond their formative years - as these particular examples will be - are best handled by selective removal of a percentage of entire, comparatively played out looking branches over a period of years. Rather than arbitrarily cutting the entire specimen off at the same level all the way across in one go.
