Thanks to modern health practices, we’re living longer than ever. But with that longer lifespan can come a host of issues that make aging feel like a tough slog. One reason? Your immune system ages right along with the rest of you. As we grow older, the immune system naturally begins to undergo a process known as immunosenescence. That means the body’s defenses become less sharp and less flexible. Too many worn-out T cells stay in circulation, while there are fewer fresh, “naïve” T cells ready to recognize and attack new invaders. That can make the body less able to…

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