Filter caps last between 10-15 years. Life span is a function of the quality of the cap,(some are better then others), the ambient temperature surrounding the cap,( high temps. will lessen cap life, and how long the caps are left idle. Generally speaking, leaving an amp on all the time gives the filter caps an easier time of it. In most cases that's just not feasible. If you like the product, and want to make a nice improvement, especially in bottom end performance, replace the caps.
