 
 <translate> I would currently be 4 * 4 = 16 years old, since I'm 4 times older than Billy's age of 4. Therefore, in order to find my age at Billy's birth we'd simply subtract Billy's age of 4 from my age, meaning I was 16 - 4 = 12 years old. So the final answer is 12. <hau> A halin yanzu zan kasance 4 * 4 = 16 shekara, tun da ni ne 4 sau ya fi tsufa fiye da Billy ta shekaru 4. Saboda haka, domin mu sami shekaruna a lokacin da aka haifi Billy za mu rage shekarunsa 4 daga shekaruna, ma'ana ina da shekaru 16 - 4 = 12. Saboda haka amsar karshe ita ce 12. 