Compustat-Calculating a firms age (not based on IPO-data)

[Caro Simon]

Hello!

For my masterthesis I am using the Gfunda as well as the Northamerica Database in Compustat. I need to calculate a firms age, based on the date of incorporation of the firm and not its IPO. How can I achieve this?
I would be very grateful for your advice!

Best,
Caro

[Justin Niakamal]

It sounds like personage (type ssc install personage in Stata) might be of use to you.