If we moved back to Australia and then came back to the UK in ten years, I don't think any of Helen's friends would remember me. I'm just not that salient a part of their lives. A more interesting question is, would I recognise them after ten years away — what are all these little children going to be like at fifteen? They all seem as distinctive as anything now, but the evidence on personality persistence is limited, and tends to only involve broad features of temperament.
Anyway, whenever I think about planning the future, I try to imagine what Helen will be like at fifty and I realise that I have no clue.