how old were you when you became a scientist?

Question: how old were you when you became a scientist?
- Keywords:
  career,
  personal,
  scientist
Asked by harryblackops to Rosie, Juan, Joe, Kate, Rory on 10 Mar 2014. This question was also asked by juniorbubblegum.
- Rosie Coates answered on 10 Mar 2014:
  
  I think I only started to feel like a proper, grown up scientist about last year so I guess I was 24 years old…
- Joe Sweeney answered on 11 Mar 2014:
  
  I think I started as an amateur scientist when I started building Lego at 2. And I agree with Rosie, I only very recently started feeling like a pro!

Question: how old were you when you became a scientist?