The one scientific, relatively long-term study of age structures of wild orcas that does exist (Life History and Population Dynamics of Resident Killer Whales [Orcinus orca] in the Coastal Waters of British Columbia and Washington State, P. F. Olesiuk, M.A. Bigg and G. M. Ellis, Rep. In Commn [Special Issue 12], 1990; see: http://www.freemorgan.org/wp-content/uploads/2012... clearly indicates that female orcas in the two orca communities studied had a mean life expectancy of 50.2 years, and typically gave birth for the first time at the just under fifteen years of age. Only one of SeaWorld's female orcas is, by SeaWorld's own admission, "close to fifty."
Males in the study by Olesiuk et al. had a mean life expectancy of 29.2 years, though much older males are known. There really is no comparable study, but ongoing work has underscored its accuracy. Captive orca ages are, of course, known with greater accuracy, and they simply do not live as long as do wild ones. Twenty years ago, some 65 orcas had been caught for the zoo and aquarium industry -- but, at this time, only three of them are still alive.