I want to know the answer to the following question:
How old was Bell when he wrote his paper?
All the background I'm provided with is that "Ellis immediately wrote back indicating that the experiments were similar to existing work in Germany, and also lent Bell a copy of Hermann von Helmholtz's work, The Sensations of Tone as a Physiological Basis for the Theory of Music.". Is that enough to answer the question?
Answer: no