• I think in the olden days the suggestion was to replace motorcycle helmets after 2 years of use or 5 years after manufacture, whichever came first. That was 15 years ago when I last bought one, pretty sure there's been a decade and a half of progress in stabilising plastics against environmental degradation since then, but anything you wear every day is going to be pretty second hand after 2 years. Even posh lids (cycling, not moto) will only cost £1 a week at that rate.

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