As I noted in Part 1 of this essay, my personal experience has shown me that this attraction base is not generally rare at all, but may be as common as hebephilia, and even if it was rare that wouldn't justify not giving it a term IMO; after all, a preferential attraction for specifically elderly people is probably much more rare than a preferential term for significantly older people who are not elderly, yet the former attraction base did indeed get a term that is considered valid by many social scientists.
And well, Johnny wasn't foreseen by the ancient Greeks, but terms meaning "elder" and "greater" certainly were, and that is all we need for our basic purposes here :-)