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Hi,

Which one of the following sentences is better?

1a. Age 8-9 is a good time to introduce it to elementary students.

1b. Ages 8-9 is a good time to introduce it to elementary students.

2. People with their age above 45, please step out of the line.

Thanks,

MG.
Comments  
1b. Eight and nine are good ages to introduce it to elementary students.
2. People over 45, please step out of the line-- What in the world would you use this sentence for? Is it some kind of pogrom?
The word "age" is invariable. It's for singular and plural
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Thanks MM. I just made up sentence #2.

I was more interested in the use of the word 'age'. It confuses me as I see people using both age and ages.

Also, don't you think 1b sounds a bit un-natural as what the author is trying to refer to is a range and not those two years.
1b is awkward for other reasons, which I have corrected above.
Which one is correct/wrong?:

-Several people have committed the crime, but we do not know their age(s) and gender(s).

Thank you.
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Several people have committed the crime, but we do not know their ages or sexes.

('Gender' is a grammar term.)