yugas, then we are likely thousands of years away from any golden age,
astrology notwithstanding. These cycles can last hundreds of thousands of
years (there is no fixed duration), and we are still in the early stages of this
"iron" age. "Physical plane" and "golden age" is an oxymoron. Until we
move into the etheric--and many people have done so which is why there are so many reports of OBE's, NDE's, people meditating, etc.--we are still in this "age", or more accurately, this "state".
The changes that are happening now, and have been happening for quite a while, are related to the new millennium, rather than the golden age. The move into the etheric and upward from there, will be very gradual.
Now if we're talking about the smaller astronomical ages of approx. 2160 years duration, then yeah, we're on the cusp of that, moving into Aquarius. But they are tiny compared to the yugas.