When does 'Growing Up' evolve into ''Getting Old'?

Is there a single 'stage of life' or occasion/event that marks the transition?

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And, when my mother died, my father already gone for years. I realized that now [b][i]I was expected to be a grownup.[/i][/b]

Robert · 70-79, M

@Mamapolo2016 I'm nearly at that stage. Scary