how old were you when you became a scientist

Question: how old were you when you became a scientist
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Asked by ttoomm to Alessandro, Claudia, Marina, Phil on 21 Mar 2013. This question was also asked by kirkster.
- Alessandro Guazzi answered on 21 Mar 2013:
  
  I guess that I became a scientist when I started my PhD, so 21!
- Phillip Wilkinson answered on 21 Mar 2013:
  
  Professionally when I was 23, only a few months ago in fact.
  
  Always loved science and asking questions though, so feel like I’ve always been a scientist. 😛
- Claudia Krehl answered on 22 Mar 2013:
  
  I became a scientist when I started my PhD as well and I was 26 then.

Question: how old were you when you became a scientist