Former Olympian Caitlyn Jenner voiced her support for the international swimming federation’s decision that transgender athletes cannot compete in women’s events if they didn’t transition before 12 years old. Jenner, who is transgender, has been outspoken in her belief that it’s not fair for transgender women to take part in competitive women’s sports. “It worked!” Jenner tweeted Sunday after the federation’s ruling came down. “I took a lot of heat — but what’s fair is fair! If you go through male puberty you should not be able to take medals away from females. Period.” The swimming governing …