How old is too old and how young is too young for a person to be arrested?

Woman worked in a shoe factory for many years. for years, she was suspected of stealing expensive shoes from the factory and selling them for personal profit. factory security could not catch her in the act, so they notified the police. woman was followed and video taped for two weeks. her routine was to bring lunch for her fellow workers. her pots and pans were used for the hot lunches. no one ever questioned her leaving the factory with her pots and pans, after lunch. but, we did. in our surveillance of this lady, we observed her selling the stolen shoes at an American Legion on two saturday mornings. we purchased a pair of the shoes and held them as evidence. we secured a search warrant for her home. stolen shoes were located everywhere. under the beds, in the closets and even in her garage. we had the evidence for an arrest, but one problem plagued us, her age. she was 83 years old and weighed less than a hundred pounds. this is where my question comes into play: if a person commits a crime, should their age(young or elderly) have any bearing on an arrest? do you believe a person should not be arrested for a crime if they are too young or too old?