There are lists available that identify several electric panels known to be fire hazards. Panels on this list should be replaced. The typical lifespan of an electric panel is 30 years, and it should be replaced at that point. Temperature variations can cause a panel to fail over time. The metals used in close proximity corrode and cause the panel to fail. Circuit breakers tripping or making funny noises is also a sign of potentially needing replacement. You should always consult with a qualified general contractor or licensed electrician before any work on your electric panel.