Phillip B Munoa, in academic monograph, argues the Testament of Abraham reinterprets the "Ancient of Days" as being Adam.
Phillip B Munoa, III, Four Powers in Heaven: The Interpretation of Daniel 7 in the Testament of Abraham (Journal for the Study of the Pseudepigrapha, Supplement Series, 28; Sheffield: Sheffield Academic Press, 1998)
[Academic study of the Testament of Abraham and its reinterpretation of Daniel 7; Munoa argues that the "Son of Man" figure is interpreted to be "Abel" while the "Ancient of Days" is "Adam]