The generation of The Children of High Modernity was born after 1870 and before the death of Queen Victoria in 1901.
'Their War' was the Great War, WWI.
They had children, usually when they were between 20 and 40.
For their kids, 'their war' was WWII and they were flattered by being called "The Greatest Generation" by younger authors who wanted to sell lots of books to them.
Their grandchildren were usually born between 1940 and 1960, the (Atomic) Boom Generation : 'their war' was Vietnam.
For example, my grandfathers were born in the 1890s and served in WWI. Their kids were born in the 1920s and served in WWII.
I, like virtually all their grandkids was born in the 1950s.
While, as a Canadian, I wasn't expected to serve in Vietnam, some kids at my two high schools did volunteer to go do so.
The possibility that a right wing government might send Canadian kids off, as right wing governments did in Australia and New Zealand ,was always on the minds of kids like me who were of prime draft age at the height of the Vietnam war.
By the late 1960s, as one generation largely defended the Vietnam war and another one largely opposed it, The Children of High Modernity faded from the public discourse - through death or ill health.
I wonder if they died angry, as they saw all that their High Modernity generation had done for (and to) the world, was beginning to come under sustained attack from their own grandchildren.....