60 - 3.5%
65 - 2.5%
70 - 2.2%
On average, 8.2% of the Roman population was over the age of 60. Which makes one in every 12 Romans. I'd say that nets us more than 10 000.
As for the recent history.
Here's a picture of an Iraqi born in 1788, the picture was taken in 1895.
Well. Now bring them here and make them prove their age. That's what said.
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And while you'll be bringing them, you could explain to me what does it all have to do with tardyness of teenegers and lower rate of marriages today, because I'm still missing that part 
How about the opposite, give me proof that a 60 year old or for that matter a 50 year old skeleton pre the 18th century world was an unheard of miracle of archaeology.
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Which is something I never tried to answer or even questioned you about.
Hmm. Firstly, I'd disagree that you weren't expected to live together for more than a few years. Given ones life expectancy if you actually managed to get to a marritable age and given that families of those times were expected to have an amount of children numbering well north of 10. Unless twins are 10 times as common as I thought, I'd say you'd be at the very least expected to live together for a decade and at most to about two.
It'd say that current tardiness is more to due to the view of marriage rather than anything else. Your feelings on the subject of your spouse ranked somewhere between "cry some moar" and "tough shit, luv" in those times. Being single would nearly certainly mean that'd you'd starve be shunned by the community and that the holy union was more of an economical and political deal you had because you were told to more than anything else. Not to mention that just generally "I want x" mattered to the world and the ones around you about as much as that fly I swatted 15 minutes ago.
In comparison, current marriages, at the very least those without children, are binding only to the point of petty feelings. Given such a change, I'd say it's natural for marriages to become a less time consuming endeavour.
Also. I would also say that the divorce rates aren't exactly all telling either. After all, a happily married family only counts as one marriage, and a dick or a whore who remarried and redivorced 6 times count as 6. I would like too see the difference between the statistics of the chance for an individual to find a happy marriage compared to overall average divorce rates. But I'm far too tired to do that.
