OS X :: Increasing The Toolbar Icon Size?

New to Macs and struggling a bit with the high res/ average eye sight combo.

I've managed to get most of my apps text sizes ok for me to see (though FF skews things up a bit), but I find my toolbar icons and text size to be a bit small for me.

Two main apps cause me grief. Mail and Office. I can't seem ti find anywhere where I can increase the size of the toolbar icons. In mail i can use Large icons, but that doesn't affect the toolbar. In Office (mainly Word/Excel) I can't seem to find anything at all.