Howard Gantman didn’t exactly have a plan for retirement. Rather, he wandered into it during the early months of COVID chaos. Nevertheless, retirement is going better than he’d expected. Gantman, who read comic books and science fiction voraciously as a child, has rediscovered his passion. He joined a writing group on Zoom and is working on a science fiction novel of his own. (And no, he’s not disclosing the plot yet.) “I’m happier doing this than I would’ve been if I’d continued to work. I really was ready for a change,” the Washington, D.C., resident said in a recent interview. “Aside from a gruesome virus that keeps on whacking us on the head, I feel more in control of my…