My son has down syndrome (karyotype a 47,xy,+21), he is also hearing impared (22 years old). are these related?

A high percentage: of infants, children & adults with DS have hearing impairment. In the young, conductive hearing loss is very common because the narrow Eustachian tubes lead to chronic middle ear disease. However, sensorineural hearing loss is also more common in those with DS than in the general population & can co-exist with conductive hearing loss. Decreased visual acuity for various reasons is also frequent.