It has been argued that the result was caused by differential voting patterns among younger and older people. According to Opinium, 64% of eligible people aged 18–24 voted, whereas 90% of eligible individuals over 65 voted. It is argued that older voters were more likely to vote 'leave' due to having experienced life in the UK prior to 1973, when the UK joined the European Economic Community which later became the EU, and this memory as well as any potential nostalgia may have influenced their decision.