Recently one of the two bills (S386) which seeks to lift the per-country green card limit, was blocked again in the US Senate, dashing the hopes of many Indian families whose children have aged-out (turned 21) or are in the process of ageing-out. Once the children turn 21, they can no longer continue with their H-4 visa.

from Times of India https://timesofindia.indiatimes.com/business/international-business/aged-out-kids-in-us-must-opt-for-international-student-visa-or-self-deport/articleshow/71374324.cms