If I were asked about the ideal age for the CFO, I would say 45-60 years. Why?
To run a business successfully, a standard set of "professional skills" like knowledge of the market, modern financial models, policies, and practices is not enough. Any new challenge may put a young financier at struggle, with no ideas of further actions. A simple life experience is essential to make it easier to tackle any difficult case.
This is crucial if a company is committed to stability and does not want to constantly operate under stress. Most of the major foreign companies do not recruit CFO specialist younger than 50 years, explaining this by the lack of the professional maturity.
To support this, let me give the results of a study conducted by the consulting Agency of Alvarez & Marsal:

