“When I grew up …” Dr. David Gottlieb can tell you the changes he’s seen in the world of kids and teenagers the past 34 years of his practice as a child psychologist in Homewood. He will be closing his practice in December. You may remember a simpler time before computers and cell phones, electronic games and television reality shows. Gottlieb has seen how all the latest devices have been influencing children — for good or ill — and he counseled them and their parents on how best to cope. He’s also had to help his young patients . . .