Even though you can keep using the modem until it stops working, new and updated modems drastically improve internet performance. It is usually recommended that you upgrade your modem at least once every five years. Try to upgrade or replace your modem every two to three years if you want to use the latest technology. With a newer cable modem, you will enjoy faster uplink speed, faster download speed, and better streaming capabilities. It is also important that you choose a modem that meets your internet connectivity needs.