your post makes me think about how historians always refer to these things called “historical moments.” and it’s a really nebulous term, probably meant to sound cool and smart. but what i think is interesting is that “historical moments” (at least as i understand the jargon) are much longer than what you are describing–like a year, or 50 years or even a century–and time (or moment) is tied together by some kind of significant change (social, political, cultural, etc.) occurring over a long period. so maybe when it comes to reflecting on the year on your birthday, whatever life changes or processes you’ve experienced might also be called a “moment.”