I would guess that the Hobbit's Coming of Age at 33 wasn't yet conceived by J.R.R.T at the time of The Hobbit.
He didn't know he would one day be writing a sequel, and I'm sure that when he did get around to writing FOTR he probably never considered the ages of Otho and Lobelia to be overly significant, minor characters that they were.
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Music alone proves the existence of God.
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