In terms of the cycle we might currently be in, I’m guessing that whilst “Augustus” isn’t going to be born for another few decades, would I be correct in saying “Caesar” is very much alive by now?
It depends on who you ask, of course -- some people expect things to happen "faster" than I do -- and as we know, nothing in macro-history is pinned to exact years; things happen within fairly broad margins. (In long-term predictions, margins of multiple decades. In shorter-term ones, I'd generally assume a margin of about a decade in either direction.)
Baesides that, we're really talking about generations, here. Consider that Trump is an unusually old "Gracchus", and Marius himself was unusually old for the role he played. Conversely, Augustus was unusually young.
I wrote about about this over a year ago, and I'll re-post my remarks from back then.
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I think each generation (going by current age expectancy), enjoys a large degree of cultural and political supremacy from about 50 years after the start of its "birth bracket" until about 70 years after the end of its "birth bracket". A generation goes functionally extinct about 90 years after the close of its "birth bracket". (Some members survive a bit longer, obviously, but they no longer exert the dominant force over society.)
So, for instance, Baby Boomers are generally assumed to have been born 1946-1964. They gained cultural supremacy in the mid-'90s, which checks out: they were "yuppies" in the '80s, but moved up to serious management positions in the next decade. They'll hold onto power in a lot of places, even after a younger generations starts to supplant them, because the positions of the
most power tend to be reserved for those with seniority. But by the mid-2030s, they'll be out of power for good. By the mid-2050s, they'll be functionally extinct. (Note that in the period they are already out of power, but still alive "in retirement", they still hold considerable
social power.)
We can do this for all generations. It's not super accurate, but it's close enough for an impression. This also shows you the periods of generational power-transition. There's always multiple generations having a major influence. Usually, one the youngest of three really muscles its way in, the eldest of three generations is already about done.
Keeping in mind that they're 'fuzzy-edged', and that the years are only ever an appoximation, I think the generational succession looks about like this:
Boomers: born 1946-1964, reign 1996-2034, extinct 2054.
Gen X: born 1965-1980, reign 2015-2050, extinct 2070.
Millennials: born 1981-1996, reign 2031-2066, extinct 2086.
Gen Z: born 1997-2012, reign 2047-2082, extinct 2102.
Gen Alpha: born 2013-2028, reign 2063-2098, extinct 2118.
Gen Beta: born 2029-2044, reign 2079-2114, extinct 2134
Gen Gamma: born 2045-2060, reign 2095-2130, extinct 2150.
Gen Delta: born 2061-2076, reign 2111-2146, extinct 2166.
Consider that in light of the expected dating(s): "Neo-Marian revolution" c. 2060, "Neo-Caesarian revolution" c. 2090, and "Neo-Augustan triumph" c. 2110-2115.
This tells us that a Neo-Marius could well be a leading figure from Gen Z, who (by virtue of his radical positions) binds a lot of the ascendant (and by then increasingly dissatisfied) Gen Alpha electorate to his cause. (By reasonable expectation, a Neo-Marius figure should be at least in his 40s around 2060. Actual, historical Marius was 70 at the height of his power, but he was an outlier. You might expect this figure to be a bit younger in most cases.) His leading opponents will be the "top dog" Millennials clinging to the highest seats of power even as their generation is beginning to fade away.
A Neo-Caesar, quite similarly, could be a "late-born" member of Gen Beta (born around 2040?), most of whose generational cohort grew up in a world shaped by the anti-(Neo-)Marian / "Sullan" reaction. Like his Marian predecessor(s), he'd win the loyalty of a new "young guard", namely Gen Gamma, who would by then be looking at their dwindling prospects and scream for a radical turning.
A Neo-Augustus would then most probably be a member of that Gen Gamma, and would lead them into a reconciliation and normalisation after the preceding chaos. Gen Delta would be very young during Neo-Caesar's reign, and would welcome Neo-Augustus as their benefactor when he restores stability just as they're looking to get their lives in good order. They'd be the true "consolidating generation" of the Principate, and they'd be the ones singing Neo-Augustus's praises when he dies (leaving them a better world than the preceding generations inherited).
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The above gives a handy overview of when we might expect certain figures to be born, roughly. But as I said in my preface, the expected dating of events can easily be off by a decade in either direction, and people can be unusually young or unusually old. If our "Caesar" is to appear around 2090, then he could be a child now, and triumph at a relatively old age. But typically, such a man is not so old. More likely to be in his fifties than in his seventies.