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You can become color blind later though.

Commercial pilots are generally required to take a regular medical (it's every 6 months or 12 months in the UK).

If a pilot were to acquire colour blindness, they'd be obliged to ground themselves and report the condition to the aviation authority.

Or temporarily from medication, particularly those used to treat erectile dysfunction and benign prostatic hyperplasia [1][2].

... and as a professional pilot, you'd probably have to consult a flight physician if you were taking meds like these.