The cello is really hard for me to play, but anyway, didn't Lionel Tertis start playing violin rather late as compared to people like Menuhin or Heifetz? I think 13 or something? Started viola later. And he became the world's most famous violist at the time, and probably is the best of all time.

That just shows that starting late means nothing if you have a determination to match.

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"Aufersteh'n, ja aufersteh'n
wirst du, mein Herz, in einem Nu!
Was du geschlagen
zu Gott wird es dich tragen!"
-Gustav Mahler