How many of us are OGs?

I'm old. I know. Thansk for reminding me. Yes, my back hurts. So does my knee.

Anyway, how many of us have been here since the dawn of time? And by that I mean since the first Hunger Games book came out. Pre movies.

I got Mockingjay for Christmas one year. I read Catching Fire on my B&N Nook. I remember when Jennifer Lawrence was announced and people weren't happy.