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  • about how to calculate Firm age

    Hi everyone, I would like to ask how to calculate firm age if I want to use the WRDS database?
    According to my key paper "A natural log of the number of years since the firm's foundation", it should be calculated like this.
    But I don't know what data to look for. Should I use the data from Compustat or BoardEx?

    Thank you for your help!
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