moon7296 1. Is "At" in the sentence optional? No.
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moon72961. Is "At" in the sentence optional?No. You may hear someone say it without "at", but "at" really should be used.
moon72962. Is "At" placed in a different position (ex: What age is it safe for my baby to fly at?)You can put "at" at the end instead of at the beginning. That's OK.