Sentence:  It would authorize the Texas Education Agency to establish county-wide day schools for the deaf in counties of 300000 or more population , require deaf children between 6 and 13 <WSD>years</WSD> of age to attend the day schools , permitting older ones to attend the residential Texas School for the Deaf here . 
Meaning of the word marked with <WSD> tags:  a period of time containing 365 (or 366) days