Nut adjustments

[brianf]

My old fingers have tough time pressing the G strings at the second fret. I'm thinking of lowering the string height at the nut. Why would it not be a good idea to set the clearance as low as possible, while preventing buzz? What is the theory on string height at that point?

[woodwiz]

Look here:

Nut adjustment (http://www.frets.com/FRETSPages/Musician/GenSetup/NutAction/nutaction.html)