Does pitch get lower with age? That would correlate with larger companies tending to choose more experienced CEOs. That aside, there are other forms of biases,

Does pitch get lower with age? That would correlate with larger companies tending to choose more experienced CEOs. That aside, there are other forms of biases, like people preferring better _looking_ leaders (based on socially perceived ideals on height, color, religion, hereditary status) and so too will they prefer better sounding CEOs.