The search for Richard Kremer, a nonagenarian from Castro Valley, has become a pressing concern for the Alameda County Sheriff’s Office, prompting authorities to seek community assistance. Kremer, 91, was last heard from on July 19 when he made a telephone call around 2 p.m., mentioning he was at a hotel located on East Castro Valley Boulevard. His subsequent unreachable status, resulting from a disconnected phone, has raised alarms about his present whereabouts and well-being.