The older a person gets, the more susceptible they are to disease. Relatively few people are fortunate enough to be able to stay healthy and fit into old age. In general, frailty and weakened immune systems go hand in hand with aging. As the function of the immune system diminishes with age, people also have a noticeably higher risk of infection as they grow older. This can be seen every year during waves of influenza and also more recently during the corona pandemic.
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