The accelerated aging of immune systems may hold critical keys to understanding human healthspan decline. While most aging research relies on mice with 2-3 year lifespans, this breakthrough reveals how immune deterioration unfolds in a vertebrate that ages within months. Turquoise killifish naturally live only 3-6 months, making them exceptional models for observing complete aging trajectories in real time. The research demonstrates that killifish immune systems undergo rapid transformation characterized by spontaneous inflammation, genomic instability, and functional collapse. These changes mirror what occurs in human immune aging but compressed into an observable timeframe. The inflammatory cascade appears linked to DNA damage accumulation within immune cells, suggesting genome integrity loss drives the chronic inflammation that characterizes aged immune systems. This finding challenges the traditional view that inflammation simply accumulates with time. Instead, it positions genomic instability as a primary driver of immune system aging. The killifish model offers unprecedented opportunities to test anti-aging interventions targeting genomic stability. Unlike mouse studies requiring years to observe outcomes, killifish experiments can reveal intervention effects within months. This compression factor could accelerate the development of therapies aimed at preserving immune function during aging. The research provides compelling evidence that immune system aging follows predictable molecular pathways across vertebrate species. For longevity researchers, this validates the killifish as a powerful tool for understanding how genomic damage translates into functional decline. The implications extend beyond basic science—if genomic instability drives immune aging, interventions protecting DNA integrity might preserve immune function and extend healthspan in humans.