This phase starts at the point where the leading edges of the generations reach and overflow into new phases. This introduction of new archetypal expressions into each phase triggers increasing instability and dysfunction in the saecular dynamic supporting the current mood.
What is the saecular dynamic? How does it create a mood? How do generations arise in the first place?
The central problem here is what S&H call the generations problem. People are born all the time. People come of age all the time. People become leaders all the time. How does this continuous process get discretized into generations?
S&H present a set of mechanistic arguments that I refer to as their constellation model. They are scattered through the book Generations, but I believe I have cobbled them together into a coherent whole.
Let us denote L as the length of a generation. Consider four key roles that people as members of a generation can play throughout their lives. Assume these roles are played at an average age of A1, A2, A3, and A4.
Consider a collection of cohorts (a generation) born in year 1 to L. This collection will dominate role 1 in the years 1 + A1 to L + A1. They will dominate role 2 in the years 1 + A2 to L + A2 and so one.
We now define these roles to be phase of life roles, which means that the different value of A are spaced L years apart where L is the length of a phase of life. Let the first role of life is birth, which defines an era. Birth is accomplished at an average age of zero, so A1 = 0. Since the othe rages are spaced L years apart this means A2 = l, A3 = 2L and A4 = 3L.
Thus, the generation will dominate the birth role in the years 1 to L, which is when they were born. They will dominate role 2 in the years L+1 to 2L. They will dominate role 3 in the years 2L+1 to 3L. THey will dominate role 4 in the years 3L+1 to 4L.
Now how old with the first cohort (born in year 1) be during these times when its generation is dominating successive life roles?
Role 1 (birth) age 0 to L-1
Role 2: age L to 2L - 1
Role 3: age 2L to 3L -1
Role 4: age 3L to 4L - 1
S&H claim that L = 22. In this case the first cohort will be
Role 1 age 0-21
Role 2 age 22-43
Role 3 age 44-65
Role 4 age 66-87
These we recognize as the phases of life. Role 1 corresponds the youth phase of life. Role 2 corresponds to the rising adult phase of life. Role 3 corresponds to the mature adult phase of life. Role 4 corresponds to the elder phase of life.
I have already noted that role 1 is birth. Thus the key
generational role in the youth phase of life is birth. Is it when you are born that establishes generational membership.
Role 2 is coming of age. This is a role performed during a fairly narrow band of ages centered on L.
Role 3 is some "mature" role perfomed by people at an average age of 2L
Role 4 is some "elder" role performed by people at an average age of 3L.
For example the average age of gray champions should be equal to 3L.
Let's look at some. FDR was age 50-63. Lincoln was 52 to 55. Ben Franklin was 70 to 83. Sam Adams was 51 to 59. The average age at which gray champion roles have been executed is 61, implying L = 20.
What sort of role is the mature adult role that is played at an average age of 2L? S&H suggest leadership, but obviously not always (gray champions are often leaders too). If we look at the average age of political leaders we find that before the mid-18th century they averaged about 41 years in age, implying L = 20. Today such leaders are 56, implying L = 28.
Kurt Horner suggests a special role for leaders in their final years (when they occupy the highest positions they ever will). In a pre-industrial society this role might have been played around the average age of leader death, for which I have found a value of 51, implying L = 26. Kurt also suggests that at such times, coming of age realy meant coming into your inheritence. Looking at the average age at which English monarchs inherited theihr throne we see a value of 27 years, implying L = 27.
Thus if we use birth, coming into inheritance and age of leader death (life expectancy at COA) as the ages for the different phase of life roles were get L = 26-27. With such a large L, there isn't really anyone playing role 4 and we have the three phase model you have called for.
If you look at the elder roles S&H call for you can see that they mostly are staying out of the way (i.e. no role at all). For example the elder role in the High is to be
reclusive (i.e. elders don't play a larger societal role). The elder role in the Awakening is to be
busy with one's own life. Once again elders are not required to play a characteristic role. The elder role in the Unraveling is to be sensitive. That is, condone whatever the younger gens want to do--don't have an impact on your own.
Only in the Crisis is there an elder role, and that role is visionary leadership, which is the same type of role played by the generation before them. In other words, bump up L and you will see Nomads playing GC roles without a problem. The elder role in crises is duplicative.
So we can dispense with elder roles without harming the constellation mechanism.