Very Old in Large Numbers

Sounds like success, one by one.
A great many very old
Shows odds are good you’ll survive.

Yay for endurance, hooray!
Cheers for the very long life!
Why do the strategists frown?

What have they got against life,
Who want their own to be long?
Too much success will break us,

And others will replace us,
Young nations run over us,
If we go on with long lives.

You need to outlive your cells.
Society does as well.