Should I Change My Thermal Paste?

I've got an FX-8350 OC'd to 4.4GHz on stock voltage cooled by a 212 Evo with 2 fans on it. I built my PC around December 2014 and I used Actic Silver thermal paste. Should I change out the old thermal paste with a new dab of the same brand or is it not old enough to warrant changing yet?