Any adult male Catholic can (in theory) be elected Pope.
>> Any adult male Catholic can (in theory) be elected Pope. <<
Not exactly. The requirement is that the man be eligible to become a bishop, since the job is "bishop of Rome," which would require that he be eligible to become a priest. There was a conclave in the middle ages in which they were hopelessly deadlocked. In came a mere brother, who had been told by God to journey to Rome. They siezed him, ordained him, and made him Pope. Then they decided they didn't like him, and abused him badly. He reigned but one year, and was one of the very few medieval popes to be sainted. I do not recall his name.
If you want to get really theoretical, there's no requirement that he be an adult male. Pope James I, anyone? ;-)
Current law restricts eligibility to cardinals, however.