Candidates of the New Greatest Generation

[12th Doctor]

A "Hero" generation has, thus far, been the only one to have been absent from the pattern before (in the early 19th century we went directly from a reactive to an artistic generation).  But the "crisis" need not be hugely Earth shattering.  Rather it need only be something that shatters the relative peace of (and basic assumptions being reworked during) the Unraveling (in which they were born) and that this crisis must happen while they are coming of age (hence why we missed one before, the generation between 1820-40 were born in an awakening, and came of age in a crisis, but took on many of the characteristics of the Nomads rather than the Heros)... I would say that we have undergone a prolonged "crisis" stage since 9/11, no one thing destroying the peace, but rather a series of things that have done so.

[12th Doctor]

Also, more recently, the break between "Y" and the current generation being born has been placed closer to the mid-90's.