How do I increase the font size in Mac OS? Not resolution change.

Basically I'm looking for the Mac OS equivalent of the simple setting in Windows to set the system font size to 'Large', that adjustment where you specify a higher DPI by clicking a radio button for "Small", "Medium", or "Large", or changing the DPI with a slider.

I'm not looking to set the LCD to the wrong resolution.

I tried using the third party application TinkerTool suggested elsewhere and furthermore adjusted font sizes in various areas of the OS, but this doesn't fix the underlying issue that the fonts are still too small in the majority of the OS.

More or less the person that bought this has written me an email, verbatim, that states, "I am quite disillusioned right now but will sleep on it. Can't believe Mac could make such an inferior product." I suggested to hold on and perhaps someone on the official forums will have some advice.

Thanks in advance!