[text] Q When was 4 my sister was 2. am now 44. How old is my sister Programmer 44 42 42 Tester When was 4 my sister was 2. am now 44. How old is my sister 2 aswer 3 Follo 100 Answers Samuel Lipoff studied at Harvard University tough one. She might be 42 but she could be 41 or 43 also since you dort say ur birthday is and her birthday is. Also she could be dead. Finally you might have thought she was your sister but actually your mom had an affair with another man and the woman who is 13 years younger than you s not actually your sister. But your mom may given away your real sister for adoption in which hes probably older than you. its tough Finally what if you think your sister is dead but she actually has become an astronaut on a secret government project for near lightspeed travel Then your sister would be aging more slowly U s ould potentially be even younger than 41