Handwriting is so unique that it can be analyzed. This is because all children learn to print or write cursive by copying the same models of letters, but each child copies just a little bit differently. Over time and with use, those differences become more pronounced. By the time we are teenagers, our ability to write is automatic. As adults, our handwriting is unique to each of us. As we age, our handwriting changes under stress, with different health issues, etc., and continues to evolve and change right up until the day we die.
Among the many handwriting traits that can be analyzed are slant, speed, size, spacing, pen pressure, and position of handwriting on the page, as well as the finer characteristics of each letter, including the cross bars on t’s, the dots on i’s, and the height and width of alphabets, spacing between the words. No two handwriting samples by two different writers are ever exactly the same, no matter how similar they may appear to be on the surface.