I'll be doing well to stay alive to my natural span.

And you know he lived far beyond the natural span of a man's years.

Maybe not the natural span of life - medical science has already torn that - but the web of human connections.

Even if its natural span was shorter than his, the difference in their ages might give them an equal number of remaining turnings.

The natural span of a human life is very great.

In the natural span of life we live often to a thousand years, but during that long period our appearance seldom changes but little.

Why should anyone who had not known how to make use of life seek to prolong its natural span?

Lived a natural span, then shrugged off that face and found another.

But there was no way for me to revoke the spell before its natural span expired.

I cannot prolong your life a moment beyond its natural span.