Relating to or characteristic of old age. [L. senilis]
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se·nile 'sēn-.īlalso 'sen- adj
1) of, relating to, exhibiting, or characteristic of old age <\senile weakness> esp exhibiting a loss of mental faculties associated with old age
2) being a cell that cannot undergo mitosis and is in the stage of declining functional capacities prior to the time of death <\senile red blood cells>
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se·nile (seґnīl) [L. senilis] 1. pertaining to or characteristic of old age. 2. manifesting senility (def. 2).Medical dictionary. 2011.