Does anyone know if there are any active organizations/agencies/startups working on solution to match empty nester with young renters? I have an uneducated hun

Does anyone know if there are any active organizations/agencies/startups working on solution to match empty nester with young renters? I have an uneducated hunch that due to houses becoming more of an retirement investment, older people with no dependants are not downsizing, causing downward pressure and not allowing younger people to move into larger houses to raise families.