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定年， 停年， ていねん
1. (compulsory) retirement age, age limit
2. (compulsory) retirement (on reaching retirement age), mandatory retirement
3. minimum years of service at a particular rank before eligibility for promotion (in the Imperial Japanese Army and Navy)
退休年纪
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まで， 迄
1. until (a time), till, to, up to
2. to (a place or person), as far as
3. to (an extent), up to, so far as, even
4. only, merely
到，到……为止，直到；到某地，去见某人
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
