I'd rather a homeowner exercise their old breakers and possibly end up with the problem of not being able to reset them...Because they're obviously faulty to some degree...Than have them not trip when they need to. :huh: Not exercising them due to that possibility is like not changing the oil in the car because the oil fill cap might not go back on.I would hesitate to recommend exercising old breakers. Not that I disagree with the concept, but it's been my experience that breakers (ESPECIALLY Federal Pacifics) that have sat there for decades won't reclose after you trip them. Then you're stuck with a box that you can't find breakers for.
Particularly if you live in an area with fire ants (they love electrical devices) and gum them up regularly.