We're not being ageist, here. As long as the Suzuki can run the company to the satisfaction of investors, he absolutely deserves the top spot. According to Bloomberg, the issue making shareholders so edgy is that the business doesn't have a transition plan in place. The president obviously isn't a young man, and folks are worried that if something happens suddenly, there could be chaos deciding a successor and a free-falling stock price.
Suzuki's tenure at the company is somewhat astounding. He married the granddaughter of the founder and took her name because the family had no male heirs. In world where many people hope to retire as soon as possible, he's worked for the same automaker for the last 50 years, including stints as company president from 1978 to 2000 and 2008 to the present. Investors aren't questioning the president's ability as a business leader; they just want a clearer understanding of the automaker's future direction.