There are approximately 180 cardinals of which about 120 are under age 80 and eligible to vote in a papal conclave.
There are currently 181 living cardinals although there are only 108 cardinals who are eligible to vote for a new pope should a conclave be called.
The maximum number of cardinal electors is 120 and cardinals are ineligible to vote in a conclave upon reaching 80 years of age.
Answer: According to the Vatican Website there are 108 cardinals eligible to elect a new pope + 73 over the age of 80 and thus not eligible. The number changes when someone reaches 80 or dies. See relatd link for up-to-date information.
The maximum number of cardinal electors is set at 120.
Canon law stipulates that there can be a maximum of 120 cardinals eligible to vote for a new Pope. There are currently more cardinals due to those over the age limit.