on turning twenty-nine for the first, and only, time

Today was my twenty-ninth birthday—for real. We celebrated well at my parents' house, with gorditas, five-layer Chinese bakery rainbow cake, and an impressive Mormon minibar (aka build-your-own Italian sodas). 
My dad teared up talking about how 28.5 years ago, when I was in the process of being diagnosed with cystic fibrosis, they found an outdated book in the library that said I wouldn't live past nine. Later, when the doctor gave them an official prognosis, it wasn't much better—nineteen. 
It's amazing to be a full decade past that, on the cusp of thirty. 
I found myself thinking tonight about my dear friend Kristi, whom I still miss daily, who died unexpectedly nearly a year and a half ago. She was a few years older than I am—already on the other side of thirty—but she, like so many of my friends, will not live to have another birthday.
Our culture has been subsumed by the cult of agelessness; adult birthdays are less joyful celebration and more occasions of dread, and millions of women walk around coyly saying they're turning "twenty nine—again." Every time I hear something like this I find myself wanting to grab the speaker by the shoulders and shake them. Don't you know how lucky you are? Don't you know never to take a single birthday for granted?
So here I am: heading into my thirtieth year of life, determined to live in gratitude, without taking these years for granted. I cannot wait to close out my twenties, to head into a new decade, to swim forward toward numbers I never thought I'd reach. 
And ten or twenty years from now, if I should be so lucky to still breathe, when my silver hairs have taken over, when you ask me how old I am, I will not be answering 'twenty-nine.'