I am using Intel Pentium D 945 (ark.intel.com/products/27520/Intel-Pentium-D-Processor-945-4M-Cache-3_40-GHz-800-MHz-FSB) since October 2006..
All other component of my PC is changed since then..
I am just concerned about the life of my CPU..
Your Pentium will probably get a good life. I have one Willamette based Pentium 4 machine thats over 10 years old, and one Prescott based thats turning 10 in 2014. More modern CPUs have the possibility of 40 years. And I know the CPU of my Texas Instruments 99/4A home computer is about 30 years old.
I don't thing CPU lifespan itself would be an issue. Instead, your CPU will feels relatively slower and slower until you will finally be pressured to buy a new cpu just to run that omfg super kickass game/software on windows 13.