Longevity (life expectancy) - It's possible for bald eagles in the wild to live longer than thirty years, but the average lifespan is fifteen to twenty years. A captive eagle at West Stephentown, NY lived to be at least 48 years old.
The bald eagle can live for 20 to 30 years. The oldest living bald eagle to ever been recorded was 47 years. However, their lifespan is known to be reduced greatly in the wilds. Check out http://en.wikipedia.org/wiki/Bald_Eagle for more details.