Is this grammatically correct? What does it mean? Any possible rephrasing Since when did taking cereals (golden morn) become age-based?

The original sentence is grammatically correct but could be slightly clearer with some rephrasing. The meaning of the sentence suggests that the speaker is questioning when it became a practice or social norm for people to associate the consumption of "golden morn" (a brand of cereal) with a person's age. This implies that the speaker finds it odd or unfair to categorize cereal preferences based on age. Here are some possible rephrasings: 1. "Since when did eating Golden Morn cereal become dependent on age?" 2. "When did it start that Golden Morn cereal is considered suitable only for certain ages?" 3. "At what point did Golden Morn become age-restricted cereal?" 4. "Since when is the choice of Golden Morn cereal determined by one's age?" These alternatives convey the same idea while varying the structure.