Listeners use several acoustic cues with different relative weighting, for perceiving a phonetic contrast. The weighting depends on variables such as age and language. The purpose of this study was to examine the relative weighting of some acoustic cues to the perception of initial voicing of plosives in different age groups. Three groups of children and one group of adults, Hebrew speakers were evaluated. The relative weighting of three cues were tested: Voice Onset Time (VOT), initial burst, and the transitions to the following vowel. A similar hierarchy of cues was found in all groups, with VOT the primary one, although not in the same weighting. Adults give more weight to transitions and burst compared to children. These findings indicate the ability of the auditory system to focus on the important cues already at young age. However, there appears to be a continued shift in the weighting during development.