Without reliable demographics, it's impossible to say and give an actual statistic.
Every number would be only a guesstimate, and to be taken cautiously.
Considering that (for Middle Ages as en exemple) on 10 pesants, 4 are in bad situation, 4 in safe one, and 2 in good situation, even talking of "peasant life spawn" isn't making a great deal.
Now, a guesstimated average lifespawn (so, again, to take REALLY cautiously) is around 50/60 depending of the era and the place, after the 10 first years (and in the strong child deaths, you can count as well the stillborn childs) with only a child on two surviving (again, depending of where : towns childs have more odds).
From what I understood, the lifespawn didn't moved too much during History.
Around 40/50 in Antiquity and High Middle Ages, 50/60 in Middle Ages, etc.
Of course, depending of your situation, you have more or less odds to live old : a young roman officer from a wealthy family could have a less great one than the old slave of the same family.
Every number would be only a guesstimate, and to be taken cautiously.
Considering that (for Middle Ages as en exemple) on 10 pesants, 4 are in bad situation, 4 in safe one, and 2 in good situation, even talking of "peasant life spawn" isn't making a great deal.
Now, a guesstimated average lifespawn (so, again, to take REALLY cautiously) is around 50/60 depending of the era and the place, after the 10 first years (and in the strong child deaths, you can count as well the stillborn childs) with only a child on two surviving (again, depending of where : towns childs have more odds).
From what I understood, the lifespawn didn't moved too much during History.
Around 40/50 in Antiquity and High Middle Ages, 50/60 in Middle Ages, etc.
Of course, depending of your situation, you have more or less odds to live old : a young roman officer from a wealthy family could have a less great one than the old slave of the same family.