The answer to 'when to replace electrical panel' is that you should replace your electrical panel every 25-40 years, or sooner if you notice signs of wear or damage. Older electrical panels may become unsafe or unable to handle the electrical needs of a modern home. Signs it's time to replace include frequent tripping of circuit breakers, outdated or obsolete panel components, and visible signs of deterioration.
Replacing an electrical panel is an important safety upgrade that can protect your home and family from electrical fires and other hazards. It's best to have a licensed electrician evaluate your panel and perform the replacement to ensure it's done properly and up to code.