What is DNA RNA Supplementation

I just read about DNA RNA supplementation about a week or so ago and I think that it's something everyone should be taking. It just seems like a great thing to be giving our bodies. for anyone who doesn't know DNA and RNA are the material in every cell in our body's that has the code, recipe, building plan or whatever else you want to call it, for making new cells and body tissue. Now when a cell reproduces itself the child cell should be an exact duplicate of the parent cell. But then why is it that we get old? So one theory is that by providing our cells with extra amounts of nucleic acids, which are the building blocks of the DNA and RNA, we can help our cells to produce better replicas of themselves and by that slow down the ageing process. What could sound better?