We need to have term limits for The Supreme Court of the United States judges

The majority of US supreme court judges are in their late 70's year old. I don't believe that they fully understand the new generation. People in their age are in nursing home because they can't fully function, How can someone in their 80's and can fully remember the US constitution and interpret the law. We need set term limits so we can have fresh idea and judges who fully qualify to better interpret the U.S constitution. The current judges talk about their personal view than than what actually the U.S constitution. They need to retired and select young judges with term limits