Sixty is the New Forty

In days gone by it was often thought,
Since lives of so many were quite short
That forty made one middle-aged,
A birthday that began the stage
Of shutting down, if fairly slow,
With less than thirty years to go.
At forty one's now in one's prime;
It certainly is not the time
To think of slowing down at all;
To most the idea would appal.
At sixty one might just begin
To think of old age creeping in,
But slowly, not in any rush,
As water trickling, not a gush;
Middle-age has just begun,
With years ahead to pack with fun.
So raise a glass to toast the date,
If being sixty is your fate.
Decide that you will still be bold,
For these days sixty isn't old