Astrological ages follow the equinox: about 2,160 years each, the whole zodiac in 25,800. The equinox currently sits in Pisces near the Aquarius border, but constellation borders are arbitrary, drawn by committee in 1930, and modern star maps put the crossing around the year 2600. Estimates for the Age of Aquarius range from the 15th century to the 36th, because the boundaries are conventions, not walls. The mysticism about it, harmony, revelation, brotherhood, is modern; the age-division itself is ancient.
The 1967 musical Hair declared the age open, and the counterculture moved in immediately: peace, love, and the mind's true liberation, five centuries ahead of schedule. The premature announcement is the oldest pattern in millenarianism, the promised age is always beginning now, because now is when the speaker lives. Previous dawns were announced for the 1700s, the 1800s, and 2012. The equinox, unimpressed, kept its 72-years-per-degree pace.
The claim: astrological ages function as generational ego, a way to declare one's own era the hinge of cosmic history, and the Aquarius myth is the baby boom writing itself into the sky the way Rome wrote itself into Aries and the Piscean church into the fishes. Verdict: the age-boundary arbitrariness supports it, anyone can move the border to reach themselves. But the fish-to-water-bearer transition is a real celestial event, whenever it lands. The sky will change signs. It just will not send invitations.
If the dawning is six hundred years off, what exactly dawned in 1967?