Inability of an individual or a group to perform the given tasks up to the established standards. http://www.businessdictionary.com/definition/deficiency-performance.html.
TSA Requirements. The TSA requires that adult passengers ages 18 and older show valid photo ID at the security checkpoint. Children, however, are not required to present such identification. This does not mean, however, that children will be able to fly without it.
Turns out age has its advantages. Recent stories of a 95-year-old flier in Florida who claimed a TSA agent asked her to remove her adult diaper and an elderly flier who claimed she was strip- searched at JFK airport brought attention to the difficulties many elderly travelers encounter at security checkpoints.