I always found this a bit weird. Why do you want everybody to know how old you are? It's kind of like... hey, I did this impressive thing, please give me credit, but also, just to give it some flare and kick it up a notch, I'm also super young making it that much more impressive!
Why couldn't the title be
> Show HN: I spent 6 months building a C debugger
Why is your age relevant other than "wow factor"?