New Age has no central organisation and no agreed boundary with the wider fields of alternative spirituality and Western esotericism it draws on, and its many independent teachers, retreat centres and publishers each keep at most their own local records.
What would resolve this A sociological survey using a stated, defensible definition of participation, since belief surveys on individual New Age adjacent claims (reincarnation, astrology, psychic phenomena) measure belief rather than movement participation.
OpenSociology of religionWouter J. Hanegraaff, New Age Religion and Western Culture: Esotericism in the Mirror of Secular Thought