By Lucie Neville HOLLYWOOD AFTER a generation of ignoring the younger generation, movie makers are beginning to show some interest in the terrible 'teens. Young romance is being taken literally, if not seriously, and puppy love is frolicking on every studio lot. Hie current picture in Metro's series steps right out and announces its plot with the title,. "Love Finds Andy Hardy," and Mickey Rooney is torn between three heart interests. The bird-brain blond of Twentieth-Fox's "Jones Family" wangles a goodby kiss from her soda-jerker swain. Edith Fellows finds a grimy but staunch young Avenue A knight in Columbia's "City Streets." Deanna Durbin is scheduled to choose between a rich and a poor suitor on Universale production program this year, and "That Certain Age" will be followed by a film with the undisguised title, "First Love." At Warner Brothers, Bonita Granville has had her first screen kiss, a chaste salute from Jackie Cooper. The youngsters who were the classic sweethearts of "Tom Sawyer" are again to be teamed by Selznick. It has been a long time since such pictures as Lila Lee's "Puppy Love" and the "Babs" series with Marguerite Clark stories that catered frankly to the high school audiences with plots about adolescents and stars who were quite properly 'teen, not tot, age. Since them there have been no memorable films for, of and by juniors to bridge the gap between "Our Gang" and "Jezebel." If juniors wanted to see themselves portrayed on the screen, they had wanting because nobody, Puppy Lover of movies, in the "Hardy" series, and not at all abashed at the title. Nothing has been discovered to date that can embarrass or discomfit the irrepressible Rooney, though a number of people are looking for his vulnerable spot. One of the most adept scene-stealers in films, he has seemed prominent enough for stardom for some time, and his studio seems to be considering this step by giving him the title role in "Love Finds Andy Hardy." Lighting momentarily between scenes on the set. Master Rooney discussed the adolescent trend with patriarchal gravity. "Why, sure, I think it's a good thing for the business," he declared, teetering his chair on its hind legs. "I know I like to watch other kids in pictures, myself. But what I hope is, they won't overdo it. Y'unnerstand, it's very easy to run these pictures with human plots into the ground. You can get as tired of them as neighbors."