Mining on a gtx 960

[Kionbo]

I have a GTX 960 2gb that is about 2 years old now. Using nicehash i currently earn $1.10 a day (not including electricity)

As I am using my GTX 960 in my main PC, and my only PC, would it be worth mining and possibly ruining my GPU.

When I am mining my GPU temp is about 59 degree C.

Would this hurt my GPU as I am willing on keeping it for another 1-2 years?