Not exactly what you are asking but I think if you did something along the lines of the following in B column (assuming all the dates are in A column):
=IF(A1="","",IF(A1-TODAY()>365,YES,NO))
What you'd get is a column where if it less than a year old you'd get a NO result, and if it were greater it would say YES. You can the use conditional formatting to get Excel to colour YES in red to highlight it.
First part of that function is to keep the cell blank if there is no date in the adjacent column. Bit needless perhaps but I like to put it in anyway. The second part has the basic premise, but without being on a computer to check the formula, I can't tell if the way it is written will say yes or no when a test is over a year old.
I can check later when I'm in work.
Edit: or you can use conditional formatting in the first place.
I was just reading out what I had set up at work but I needed to have the yes/no bit...