An Odyssey EXO putter that is 2 years old. Everything else I’ve completely redone in my bag. I’m finally pretty happy with everything but still tinkering with driver shafts.
I just did a complete top to bottom bag makeover this year, so right now the oldest club is my driver, which has been in the bag for almost 6 months. Prior to that, it would have been my Ping K15 irons, which were in the bag for about 10 years.
My irons. At just under two years old, I've had my JPX 919 HM's longer than anything else in the bag. It wasn't planned, but as my swing has evolved I was forced to rethink every slot, with some positions seeing more than one change. A new driver arrives today, and I'm hoping that will be the last change for a long time.