It is great to share any Birthday with so many friends. As for reaching the half-century mark, I think Fish Wife set me at ease the best when she said: "Don't Worry. 50 is only a number.
A REALLY BIG number!"
And now, to indulge in some indivdual rebuttals (BWA-HA-HA) ...
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling