A handy website to check on the life of your screen is http:/www.tvhistory.tv/1960-2000.htm.

60,000 Hours of Life

An advanced drive circuit and inner panel improvements give Panasonic plasma panels a long service life of approximately 60,000 hours even with their increased brightness.  A recently developed phosphor also raised the plasma displays resistance to static-image screen burning to the same level as CRT displays.