reminiscences; reminiscent discussion
A talk or written piece in which people look back on past events and share memories; often used for memoirs, round-table recollections, or informal storytelling about the old days.
I enjoy listening to my seniors' reminiscences.
That book is a collection of wartime reminiscences.
思い出話 is a casual, everyday word for talking about memories, whereas 回顧談 sounds slightly more formal or structured, like a memoir or organized discussion.
Compound of 回顧 (かいこ, 'looking back, retrospect') and 談 (だん, 'talk, discussion'). The exact historical derivation is uncertain, but the word follows a common Sino-Japanese pattern for naming types of discourse.