Right, I think there's a distinction to be made between education-based cultural continuity ("we all learn Tang poetry in school") and personal cultural continuity ("I learned this knowledge/value/principle from my grandma/village elder/apprenticeship").

10 years is indeed a long time. It's not enough to break the education-based continuity, but it is absolutely enough to break the personal cultural continuity.

My experience of 15 years living in China is, very few people have experienced that personal continuity, to the point where disciplines like Chinese medicine, taiji, traditional music, etc, are best carried on by people in Taiwan or even the US.