The character "ba" in this serial

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ba, the most aged character in this serial. before twenty years ago, the character "ba" is there. when the new characters come after twenty years again "ba" was alive in this serial. still "ba" is living. how can it possible. In real life it is good that our elders (our dadi, pardadi, dada, pardada) lived with us. But in real life it can not possible due to age factor