The trouble is, we simply don't know about the life expectancy of ordinary people because it's not recorded anywhere. But if Aliénor was unusual in her life span, that would have been commented on - and the others I referred to in my post weren't "upper class". How do you know about the height of the Anglo Saxons compared to the Romans? How do you know they had grown in stature? Is this based on averages, or one or two examples? And the Romans came before the Saxons - and we don't know whether it was the Romans who introduced more efficient farming methods, either, or continued methods which were already in use by the indigenous population (see Francis Pryor, Britain BC and Britain AD). I'm not sure where your statements are coming from. I'd be interested to read any books you've consulted.
Low ceilings? Where?
Historical evidence gets revised because historians uncover evidence which conflicts with received opinions, so archaeologists such as Francis Pryor have been making many revisions to what is known about Bronze and Iron Age history - especially with regard to agriculture and farming methods.
As to the "vast majority of people" - again, how do you know? I'm not saying that a majority travelled a lot, but certainly more travelled than is often assumed, and this is borne out by DNA sampling as well as place names. But I was particularly objecting to the assumption by a previous poster that "people mostly never travelled", when all the written evidence I'm using (primary sources) show that the people who wrote down the stories I was referring to did, indeed, travel very widely.
If you're not registered with MudCat you can't send me a private message, but if you did register we could indeed continue the discussion somewhere else.