If you find the sidereal calendar just so drearily predictable, there is an alternative. Decimalise!
I am currently 16140 days old. My next centennial birthday is on 23 June this year, when I'll be 16200 days. Or maybe I'll just keep my strength for the millennial celebrations on 1 September 2011 when I hit the big 17000.
I may just call it 17 mega-days. I'll be 17 again but without the spots and hormones.
Spread the joy and work out your own: