B (老人) 老人 lao3ren2
old person, aged
alte Leute

C (老人家) 老人家 lao3renjia
elderly/ old person/ old parent
sehr höfliche Anrede für ältere Respektsperson

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Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

老 老 old, aged / experienced
人 人 man / people / mankind / someone else
家 家 house, home, residence / family

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老人病学* * + +

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from CC-CEDICT under a Creative Commons Attribution-Share Alike 3.0 License

老人' + 老人* * + old man or woman/ the elderly one's aged