U R Finally 50 50

So you are finally fifty;
Happy birthday on the big Five-Oh.
I guess you could fill a great big book
With everything you know.
A whole half century of living
Is nothing to sneeze about,
So if you're a little patched and worn,
Don't you dare frown or pout.
Ignore things that make you feel old;
It's really great to be fifty.
You're smart, attractive and good company,
And I still think you're nifty!