In an effort to replace chronological age as the determinant of pilot fitness, the Acoustical Sciences Division of the Naval Aerospace Medical Research Laboratory has been evaluating a number of auditory measures for possible inclusion in a performance-based pilot assessment battery. Preliminary data are reported for age-dependent performances on such measures as pure-tone thresholds, clear and degraded speech perception, auditory short-term memory, response time to auditory signals, and auditory selective attention. The relevance of these laboratory-gathered values to operational environment requirements is discussed. [Work sponsored by the Naval Medical Research and Development Command.]