[wavemode]

> We are "naturally" meant to die at 21

Not really? Historical life expectancies were low because it was so common to die in infancy and childhood (thus dragging down the "average").

For people who made it to 20, it was common to live past 60.

[ACCount37]

Yeah, you were just meant to "naturally" have 7 children, of which 2-4 die before they get a name. But the ones who live? They might make it past 60.

[smsm42]

Or die from an infection coming from a random splinter. Also a very natural thing.

[amanaplanacanal]

Yeah people get that one wrong all the time. They don't realize what a bad argument it is.

I'm guessing they are ignorant of historical facts and are just repeating what they heard from somebody else.

[Filligree]

People do get that wrong. But the corrected version is “you were supposed to die as a baby”, and…

That doesn’t sound any better.

[jjulius]

>That doesn't sound any better.

It doesn't, because "it was so common to", as OP stated, is not the same thing as "you were supposed to". There's no reason it should be corrected, it's accurate.