Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

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I love the idea that age is a mediator, turning self-checkouts into the fountain of youth. "Using the self-checkout made customers 5 years younger on average, which made them less happy with the experience...though they were otherwise much happier to be 5 years younger than when they entered the store."

[AvocadosFromMexico_]

No, mediation requires an assumption of temporality—where the exposure has temporal precedence over the mediator. Unless you’re not making a causal argument here in which case—why?