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المشاركة الأصلية كتبت بواسطة اوديسا If you have any comment about the following, do not hesitate to do your best you can do it tomorrow it is up to you SK SK SK SK SK From your point of view, do you have an idea about adding (S) to the underlined words? I need a convincing answer. All these sources are reliable. Bin Laden's final days -- big plans, deep fears By Peter Bergen, CNN National Security Analyst March 16, 2012 -- Updated 2327 GMT (0727 HKT) Bin Laden fretted about his 20-year-old son, Hamza, who had recently been released from house arrest in Iran, instructing his deputy to tell his son to move out of Waziristan. He also provided elaborate instructions about how Hamza might evade the surveillance of the American drones in the tribal regions by meeting members of al Qaeda inside a particular tunnel on the road between the western Pakistani town of Kohat and the city of Peshawar. ……. She brought along her eight-year-old daughter. ……. she is 4 years old

Look !!! it depends on your writing style
So, if you use numerals for ages and hyphenate, for this case you have NOT add the S like this:
23-year-old

So

using the hyphen = don't add S

e.g

20-year-old
eight-year-old

without hyphen = you have to add S

e.g.
4 years old



hope it help
Good luck