As for some (hopefully constructive) feedback: I think the year selection slider could benefit from a few adjustments. If an image is from the distant past—say, pre-1950s—it might make more sense to use decade-based precision rather than individual years. For example, a black-and-white photo had me way off that caused me to lose 20 years of my life :). It would be helpful if such images were categorized more broadly, something like “191x”.
For mid-century images (roughly 1960–1990), a 5-year interval could strike a better balance. I came across one from that era and was six years off. And for more recent images, say post-2010, a one-year precision feels reasonable.
Of course, this suggestion mainly applies if we're deducing the year based on visual cues like clothing, hairstyles, and the environment. If the game is intended more as a quiz based on the text descriptions under the images, then it shifts more into trivia territory—and that’s a different type of challenge altogether.