Comment by PeterStuer

That is because basic RAG is not very useful as a long-term knowledge base. You have to actively annotate and transform data for it to become useful knowledge. I have the same problem in the regulation domain, which also constantly evolves.

In your case, you do not want to store the age as fact without context. Better is e.g. to transform the relative fact (age) into an absolute fact (year of birth), or contextualize it enough to transform it into more absolutes (age 10 in 2025.