Have you stability tested that speed? Try running "Prime95" (a google search will net the program for you) Torture testing on it to make sure that it is a stable overclock - you don't want random crashes and lockups!
That aside, at that speed, and temperature, and with a stock (1.6) to 1.7ish Vcore your processor *should* live about 5-10 years if there are no "faults" with it. Your temperatures seem kinda high though - under full prime95 load I'll bet they would pass 50 Degrees celcius. You might want to invest in a full copper heatsink (a Thermalright SLK 800, or an SLK 900 being two of the best choices), and a quiet 80mm Panaflo H1A fan to keep the chip cooler, and even overclock it a little higher.