 
 <prompt> Kelsey don turn 25 for 1999. Her senior sister bin born 3 years before Kelsey. E dey 2021 now. How old be Kelsey senior sister? <response>: ```Kelsey turn 25 for 1999 so she bin born for 1999-25 = 1974
Kelsey sister dey older by 3 years so she bin born for 1974-3 = 1971
Na 2021 we dey and Kelsey sister bin born for 1971 so she dey 2021-1971 = 50 years old

The final answer: 50.``` 