It may be possible to age male ocellated turkeys based on the width of the copper band on their wings.

The ocellated turkey’s upper, major secondary wing coverts, or wing bar, are a rich copper color and highly iridescent.

Adults of both sexes appear to have wider bands, but more research is needed to confirm this trait. This method probably isn’t totally reliable for females after the first year.

Source: (Taylor, Quigley, & Gonzalez, 2002)
Image: Dick Daniels