By Daniel Trotta FULLERTON, California (Reuters) – A generation of children who learned to write on screens is now going old school. Starting this year, California grade school students are required to learn cursive handwriting, after the skill had fallen out of fashion in the computer age. Assembly Bill 446, sponsored by former elementary school teacher Sharon Quirk-Silva and signed into law in October, requires handwriting instruction for the 2.6 million Californians in grades one to six, roughly ages 6 to 12, and cursive lessons for the “appropriate” grade levels – generally considered to b…