Older workers tend to resist changes more because they have acquired more habits over the years than young people, this is influenced by a personality trait called "mental openness", older adults do not like to lose control of their environment and this usually generates anxiety, fear of failure and the unknown, which is why they are the ones who are most opposed to the inclusion of new systems or technologies to a company.
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One reason it was a health threat is it caused teeth to become ground down which would then lead to infections. The same was true with their eyes and lungs, sand would be blown into their eyes or inhaled into their lungs and then could cause infections.
