Rudy Marcus, a Caltech Nobel laureate, celebrated his 100th birthday and continues to work, driven by his curiosity and enthusiasm for science. Marcus has been on the Caltech faculty for 45 years and still publishes research papers, with a recent grant renewal from the Office of Naval Research. His love for work is an inspiration to his colleagues and former students, who describe him as a role model. Marcus's story highlights the importance of finding meaningful work and pursuing one's passions, even at an advanced age.