Mark suggests from 0.7 to 1 grams per day per pound of your lean bodymass.
There are online caklculators that'll give you a rough idea of your lean bodymass.
I'd have thought it would come out to around 90 grams for you. That sounds like a good figure to shoot for: I recently heard a researcher who"s an expert on protein say that while they calculate by per kg of bodymass his team believe there's a level you shouldn't go below even if you're rather small -- and that's 90 g per day.
If you think of around 30g at each of three meals. There are online tables that'll tell you roughly how much protein in meat, fish, eggs, nuts, etc. Something like 4 oz of meat or the equivalent. Get a handle on that and you don't need to weigh. Just think of such and such a food as coming in a portion the size of a pack of cards or a small paperback or watever.