We're talking about the overall life expectancy in that place and time due to what is now viewed as a sort of moral rebellion. People lost their compassion along with a lot of their religiousness in the light of social Darwinism's survival of the fittest.
What a load of nonsense. 'social darwinism' emerging from lack of theism was never commonplace enough in Britain to cause massive rises in mortality - if you have proof otherwise I'd love to see it.
The life expectancy is that low because of infant mortality, btw. They're not independent statistics. What, you think there weren't 30, 40, 50 year olds in Victorian times? There was just a massive skew on the life expectancy from nearly half of children not making it past their first year.
The life expectancy in London for a time was indeed 14/15 and part of that was because of the child abandonment which yes played a lot in it.
We're talking about an average, so yes there were older people, otherwise who was having the children? Things settled, the average life span went up to 40 later.
Which has nothing at all to do with the presence or absence of religion, and everything to do with its practitioners actually practising what they preach. Just as in any time, with any religion. In fact, philanthropy and charity in the modern sense emerged during the Victorian era, leading, among other things, to the establishment of public schools.And it wasn't just the children, as you see from the stats the numbers are shocking but not the whole story. If people had had the compassion to help the poor, (as per the Bible) or do what it took to prevent that circumstance in the first place and prostitution (never a low risk occupation at any time... except maybe for the Orions?) hadn't been so rampant, then the problem wouldn't have been so astronomical. But it was.
At the time it did- do to a radical shift in people's attitudes.
But in principal "everything to do with its practitioners actually practicing what they preach" is what I to believe in what is necessary.
I'm just trying to say that the world isn't going to turn into a utopia if religion just vanishes.