Hi there,
Max age for wild RTHAs listed in BNA series (1993) is 21.5 years. More
recent data from the Bird Banding Lab is 23 years, one month. No doubt some
birds live even longer out there.
Captive reds often go late 20's in age.

Bud Anderson
Falcon Research Group
Box 248
Bow, WA. 98232
360.757.1911