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If you think your Mac or PC will last you all the way through 5 years, and you hope to be able to play the best and latest games - at full resolution, with all graphic details turned to the max - on your 5-year old Mac, you're a liar.
Don't even try the "I don't play games on my Mac because Macs aren't for games" excuse.
The hardware is the same, Intel-based stuff. A computer is a computer. Only difference now is the software. The lowest common denominator is the hardware.
Wait 5 years and try to play a brand new game on your 5-year PC, then try the same game on the 5-year Mac. Not so great is it, for both sides, correct?