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This love of reading did n't wane at all in his later years , and when he found his memory failing he carved himself a seal with the exhortatory motto : " The more you forget the more you need to read . "
 his later years
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 his later years