Middle-aged people

[English Learner]

English Grammar Tests, Elementary Level

ESL/EFL Test #175 "'Age' Terms", question 8

......... people range in age, but are usually between 40 and 60 years old.

(a) Middle-aged
(b) Senior
(c) Teen
(d) Elderly

English Grammar Tests, Elementary Level

ESL/EFL Test #175 "'Age' Terms", answer 8

Middle-aged people range in age, but are usually between 40 and 60 years old.

Correct answer: (a) Middle-aged
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what diffrent between senior and elderly

[Beeesneees]

In that question, nothing. They're synonyms there.
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Cheers m' dears!

[Saneta]

isn't it something missing in the first half of this sentence: Middle-aged people range in age ? how to understand it?
thanks..

[Beeesneees]

If I reword it like this, is it any better?
Those people who are classified as being 'middle aged' are in the age-range that falls between 40 and 60 years old.
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Cheers m' dears!