I found it right here at sciencenews.org. It explains that “scientists investigated the effect of omega-3s on telomere length. Telomeres are the strings of repeating DNA sequences at the ends of chromosomes that are thought to keep them from fraying during cell division. “In cells, telomere length is a big determinant of aging,” says cardiologist Ramin Farzaneh-Far of the University of California, San Francisco…after five years, participants who started out with higher levels of omega-3s had experienced substantially less telomere shortening than the others.”