How much older was Dean butler than Melissa Gilbert on the show Little House on the Prairie?

On the show "Little House on the Prairie," Dean Butler, who played Almanzo Wilder, was born on May 14, 1966, while Melissa Gilbert, who portrayed Laura Ingalls, was born on May 8, 1964. This makes Dean Butler approximately two years younger than Melissa Gilbert. Therefore, he was not older, but rather younger than her character on the show.