I use Michelin Pro Race 650c tires. On the package there is advice for tire pressure based on riders weight. For riders under 111 lbs (50 kg) the recommendation is 6 bar, about 88 psi. Under 133 lbs (60 kg) around 100 psi or not quite 7 bar. I'm 105 lbs and have been using 88 psi for 6 years without an issue. If the LBS adds any more air I'm miserable.

I don't know if there is difference for 700c tires or other brands. It would be nice if every tire company had guidelines like this.