The good news: as we get older, we become more ambidextrous. The bad news: this new skill develops because the performance of our dominant hand declines so drastically.
Researchers at Ruhr University Bochum in Germany and the California Institute of Technology tested 60 volunteers who described themselves as right-handed. The older the subjects were, the less successful they were at motor performance tests using their dominant hand. Left-hand performance did not deteriorate as drastically with age.