00:00Scientists are taking a closer look at why immunity weakens with age.
00:04A new USC study shows the process is more complex than previously thought.
00:08Researchers examined macrophages, immune cells found throughout the body.
00:13They analyzed cells from tissues including the brain, lungs, and liver.
00:17Older macrophages showed increased activity linked to cellular stress and damage.
00:22But not every tissue showed the same aging pattern.
00:25Brain macrophages changed differently from those in the lungs.
00:28Researchers also found differences between males and females.
00:32The team combined sequencing data from dozens of previous studies.
00:36This created a broad map of macrophage aging across the body.
00:40The findings could affect how future treatments target immune decline.
00:44Researchers say therapies may need to account for specific tissues and biological sex.
00:49The study could help scientists identify pathways linked to healthier aging.
00:53Disclosure.
00:54This video contains stock footage and content created or enhanced using AI-assisted tools.
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