Ok, I understood that EVGA's were ok. Misunderstanding.
He's given good recommendations.
500w will power even current builds, such as mine.
If you don't have the money to buy a PSU how could you buy a processor and mobo?
It will work until it no longer works. There's no definite time span except for average running life of one, which even then isn't guaranteed.
If you don't have money or want to spend any to change/upgrade, and want to only know if it works: its enough to power your system and should be fine