Paraphilic infantilism and "sissy" men feel like same/diff in my mind if we're talking about anything pre 21st century...
Of course, the more direct sissy/crossdressing trope in the media of the mid/late 20th century. To be clear, I have no disrespect for those folks - it's more an observation of the prevalence of this is older/elderly male ABDLs comparatively to how much more nuanced identity is usually defined now.