Yes, you’re doomed. It’s genetics. Well, it could be that you have a medical condition that affects the production of your hair pigment. But if your parents had grey hair while young, it is likely that it is genetics and thus incurable until we’re able to hack and modify our own DNA. I’m in the same boat as you, although not as dramatic. My mum had a full grey head before 30, and I’ve had sparse grey hairs since I was 13. However my perspective is different from yours. I’m looking forward to it – grey hair is one color you cannot truly dye your hair into becoming, so I’ll be so unique with a head of long flowing grey hair at such a young age! And you know what that means? I can finally cosplay as Sephiroth!