As used in this chapter, the term "formerly migratory child" means a child who:

(1) Was eligible to be counted and served as a currently migratory child within the past five years regardless of whether or not such child actually received service as a migratory child, but is not now a currently migratory child;

(2) Resides in the area served by the agency carrying out a Chapter 1 Migrant education program or project; and

(3) Has on file a certificate of eligibility revalidated yearly by the signature of his or her parent or guardian certifying such child as a formerly migratory child.