I digitally restored the 1955 Photo circulating here recently. Interested to see if this looks more or less likely to be him from your view.

Original Photo for reference comes from here:

https://www.cia.gov/readingroom/docs/HITLER%2C%20ADOLF_0003.pdf

And it was alleged to be in Columbia (not Argentina) around 1955, or 10 years after his reported self check-out. He would ~66 years old in this photo.

One of the latest confirmed photos was in April 1945 and is viewable here:

https://www.wikipedia.org/wiki/File:Adolf_Hitler,_20._april_1945.jpg_%282%29.jpg