I too am saddened that 30 has come and gone and I'm approaching the half-way mark to 40 already! Maybe your life has been different, but it wasn't until the last 2-3 years that I felt I'd finally earned my independence in the world. Of course now that's being threatened again as I face figuring out who the real me actually is, but hey, I can pay my mortgage!
Don't mourn too much though, 30 is the new 20 after all!