how many years did it take for you to became a mathematician?

Question: how many years did it take for you to became a mathematician?
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Asked by grew522tyre to SamG, johneaston, janmckendrick on 9 Jun 2025.
- John Easton answered on 9 Jun 2025:
  
  I wouldn’t say that I was one – but I guess you can add the time spend studying (GCSE, A-levels, university) and then just a lot of time using maths and mathematical concepts in the world of work. Actually most of the maths I do on a day to day basis is little more than GCSE level, but I can go deeper if I need to

Question: how many years did it take for you to became a mathematician?