Mine is moderately old...for your standards
Driver- 3months
3-wood- a year but second hand
5-wood- year and 3months
9-wood- 2 years but second hand
Irons-2years
56*- 6months
60*- a year and 3months but will be changed soon
putter- 10months
Driver - six years
2 wood - >10 years (I reckon 13 years but I can't remember)
3 wood - >20 years
Irons - 1 years old
Wedges - <1 years old
putter - <1 month old
I do have a driver, 2 wood, 5 wood and an old Taylor Made putter that are all over 20 years old - plus - a set of Mizuno TP9s that I got 19 years ago.