I had one of these white plastic iBook G4s. My next laptop was the very first “unibody” MacBook Pro 15”, bought from a Thanksgiving sale in 2008. I upgraded the RAM to 8GB and the HD to an SSD and it still runs great today. I stopped trying to upgrade the OS so the biggest challenge now is security. Thankfully Firefox has a long-term-stable version that still runs and gets current root certs for TLS.