Seeing jinn in a form other than their true form is considered possible in Islam, but there's no specific textual evidence suggesting this ability is exclusive to children.
In more detail:
While Islam acknowledges the existence of jinn, beings created from smokeless fire, the ability to perceive them is not typically granted to ordinary humans. However, it's believed that seeing jinn or angels in a form other than their original state is possible. This is a rare occurrence and is often associated with prophets or individuals with strong faith.
The idea that only children can see jinn is not supported by Islamic texts or teachings. There's no specific verse in the Quran or hadith (sayings and actions of Prophet Muhammad) that explicitly states this. The perception of jinn is more related to spiritual insight or divine permission rather than age.
Therefore, while the potential to perceive jinn exists, it is not limited to children, and no definitive Islamic text singles them out as having a unique ability to see them.