Jeremy tells what his life was like when he was five. Back then, he wanted to be an astronaut or a cowboy or both (the last choice is accompanied by a very funny illustration of a cowboy and horse on another planet, both clad in space suits). He liked pterodactyls and his favorite secret hiding place was down by a pond. His best friend was Mark. Now that he's six, he wants to be a major-league ballplayer or a deep-sea diver. He goes in for Tyrannosaurus rex and shares only his second-best hiding place (his favorite hiding place is a secret). He still has a best friend, Mark: ``Some things never change.'' In his first children's-book solo, Howard (illustrator of Cynthia Rylant's Mr. Putter and Tabby Pick the Pears, 1995, etc.) captures an authentically childlike view of growing up. Large illustrations, done in bold black pencil, watercolor, and gouache, convey the insouciance of children's artwork, an effect enhanced by the hand-lettering of the first-person narration. A quizzical cat on almost every page adds humor, as does the presence of Mark's sidekick, a spaniel named Peggy. A quietly comic work. (Picture book. 4-8)