Fish oil certainly will not stop aging or make you instantly young again, but it may help with some of the problems related to aging. Fish oil may help reduce the risk of age-related macular degeneration, osteoporosis, strokes, and heart attacks. However, it is not clear if fish oil is useful for preventing Alzheimer's disease or cancer.
Final Thoughts on Fish Oil Effectiveness
Fish oil is effective for lowering triglycerides and preventing repeat heart attacks. It is probably useful for a number of other conditions as well. However, it is not free of side effects, and it is usually recommended that you take it under the supervision of your healthcare provider. This is especially important if you take it in high doses (which are often necessary to obtain the health benefits of fish oil).