Synonyms of 'senile'
usage note:Words such as senile and geriatric are only properly used as medical terms. They are very insulting when used loosely to describe a person of advanced years. Care should be taken when using old and its synonyms, as they can all potentially cause offence.
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Something that is decrepit is old and in bad condition. Someone who is decrepit is old and weak.
a decrepit old man
Thesaurus for senile from the Collins English Thesaurus
If old people become senile , they become confused , can no longer remember things, and are unable to look after themselves.