When did the New Age movement spread widely through occult and metaphysical religious communities?

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The New Age movement spread widely through occult and metaphysical religious communities during the 1970s and 1980s.1

While the movement’s roots can be traced back to late 19th-century theosophy and earlier esoteric expectations, it gained significant momentum as an organized phenomenon in the 1970s. During this period, figures such as David Spangler helped architect the movement by attracting leaders from established occult and metaphysical organizations. The movement further expanded as it incorporated individuals from the collapsing psychedelic scene and utilized new periodicals and specialized bookstores to foster a sense of community and disseminate its ideas. By the late 1980s, however, the movement began to lose its momentum, eventually transitioning into what some practitioners referred to as the "Next Stage" by the mid-1990s.234