Overclocking gtx 970/too hot?

[SandyCheeks]

Hello guys i just overclocked my gtx 970 by a bit (somewhere around 10-20% stronger now) and i am curious if its ok that the graphics card has around 81-83 degrees celsius now(had 80 degress constantly before for around 1 year under gaming pressure), i heard from a guy on youtube that till 85 degrees its ok and nvidia gtx 970 cards can go up till 95 degrees but that is rather unhealthy, will the livespan of the card be shortened? and btw. the pc was prebuild.