I'm here,yes i'm using some that is about 7 yrs old, and some test that is about 4 yrs old, I have noticed a loss in the EQ this yr compaired to last yr, (same brand) however the test is still good and working as expected, I upped the dosage of EQ from 400 to 600 per wk to see if that makes a difference, so in summary it depends upon the gear's shelf life.
BTW...The exp date on the bottle is just a garuantee that the product is good up to that date(gov guidelines)
RADAR