A question was asked: "Am I an old soul
if I study numerology, astrology and other metaphysical practices?"
There are young souls who may be developed more spiritually than an old soul. It all depends on the individual. And it doesn't really matter in the end. It's not a race.
Also, I wouldn't necessarily equate a study of numerology, astrology, and psychic phenomena with the providence of the old soul. As interesting as these topics may be, none of them contribute to spiritual growth in a classic sense. Old souls are more interested in casting off the tattered remnants of false personality (or ego). That's a form of spiritual development that requires more self-awareness and seeing how everything fits together as a whole. A study of Buddhism is more in alignment with such endeavors - although any soul age could study and benefit from Buddhism.
All is choice, as Michael says. A young soul could become a Tibetan monk and an old soul could be the CEO of a major corporation.
This reminds me of conversations about Servers. The server is often pigeon-holed into occupations such as being a doctor, a nurse, a social worker, or someone working retail at Wal-mart. But John Steinbeck, one of our greatest American novelists, was channeled as a server. Even more surprisingly, Alfred Hitchcock, that great director of suspense films and noir, was also channeled as a server (albeit with scholar secondaries). You can never tell just how the individual soul will choose to create their life.