Understanding and application

What does وَهُمْ أَبْنَاءُ عَشْرِ سِنِينَ specify?

Preserving the Qur'an, Prayer Etiquette, Rights, and Taqwa (Hadith 162–168)

• The state of being ten years old
• The location of prayer
• Number of surahs
• Length of travel