135F is 57C. That's really, really cool, if not idle for a desktop class gpu. If it was 135C, you're blowing something up, lol.
165F is 73C, that's towards the hotter side for a cpu but not anything super serious (85C-95C+).
My 1080 Ti is running at 71 C (just fine) with a 899mv undervolt, and my 4770k 4.1GHz CPU ranges from 75C-88C (a bit hot).
For anyone concerned about their GPU heat output, this might be a good video introduction to undervolting:
As for wear and tear, most GPUs are rated to do a lot of 24/7 work for at least the usual 3-5 year business turnaround time at stock/reference voltages. A few years back, I put like 2,200+ hours on a GTX Titan Black for a rendering project, and that's not even counting the hundreds of hours extra I spent on gaming during that time. If you have a "gaming" pc that's already well ventilated, you're fine.
If you are using a well worn gaming laptop (or general laptop), I'd be concerned about the battery+power brick and overall mobo power delivery if its like over 3 years old or something, rather than the cpu+gpu independently.
If you spend the next 3+ months straight rendering 24/7, that's a different story.