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Could you elaborate on the concept of "safe age for bubbles," please? I'm somewhat puzzled by the phrase, as it seems to combine two unrelated ideas: age and bubbles. Are you referring to the age appropriateness of children playing with soap bubbles? Or perhaps you're inquiring about the safety of investing in bubble-like financial assets, such as cryptocurrencies or overvalued stocks, at a certain age? Could you clarify your question, so I can provide a more accurate and informed response?