If conspiracy theory can accurately be called postmodern, and I’m pretty sure it can, then New Age can most definitely bear that label as well.
Rather than try to do the analysis myself, here is an excerpt from a more elaborate blog post on the subject from 2018: (go read the whole thing)
“The New Age Movement also rejects the authority of the established church, with its belief that spirituality is within, and that it is up to each individual to find their own path to inner truth.
The New Age Movement accepts relativism – there are diverse paths to spiritual fulfillment, and no one authority has a monopoly on truth, which fits in with postmodernism’s rejection of metanarratives.
The spiritual shopping approach of the New Age seems to correspond with the centrality of consumer culture to postmodern societies.”
Makes sense if you think about it!