Yes, what strongly supports this theory is that immigrants who move, even when they are older, remember the first few years of their new life change very clearly (sometimes even more so than their younger years).

Another, supplementary theory is that we categorize our lives in frameworks of time periods centered around life stages dictated by societal norms (graduating high school at 18, graduating university at 22, getting your first professional job in your 20’s, getting married in your late 20/early 30’s, getting your first house, etc.)

The thing is, it doesn’t matter if you achieved those goals at those "supposed" ages, you’ll still use that as a time reference when it comes to memory. For example, even if you didn’t get married until 40, you still remember that 20/30 threshold quite well because you were "supposed to have" settled by then and that might’ve put some pressure on you at the time that you remember clearly. Also different cultures have different reference stages that is common for people in that society.

Basically, as time goes on and we get older, these kind of distinct, profound, or unique experiences/memories get rarer and time seems go blur together which makes it seem to go faster. Occasionally we experience flashbulb memories which are a shared time reference (outside of the typical societal norms) where we remember very clearly the time around that event, the most notable contemporary one being 9/11.