Translation:My older sister is twenty four years old.
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That is a good question! I am not certain, but I believe that 岁 indicates the verb along with the age. In my other learning programs, I have never heard 他 是 二十 岁。 That, of course, does not mean it is correct! So, we could use a native speaker or someone further along to answer this... :)
It seems it wants to receive a chinese number answer, but recognition softwares generate indo-arabic numbers instead. Kinda if it wanted to receive "twenty four years" as input but instead receives "24 years" therefore marking as incorrect. This is especially annoying in lessons about dates.
I wrote "my older sister is 24 years of age", instead of "my older sister is 24 years old". It means exactly the same thing in English. Needless to say I got marked wrong, not for the Chinese being wrong, but by the limited choice of English responses.
I'm a mother tongue English speaker.