Dont worry, as long as your voltage is not too high, and your temperatures are normal than you will be fine. Overclocking does shorten the lifespan of components by a bit, but it should run for years without any problems. Unless you plan on keeping the same card for 10years+ then I would not worry. Your temps are fine, and judging by your clock speeds your voltage should not be too high, so you should be good to go. If you want, post your voltage and I will check it for you.
Don't worry, enjoy your overclock!