How old is harry in the end of book 7?

Answer 1

he was 17 years old ( and the epilogue was 19 years later , so he was 36 years old then)

Answer 2

Right before the epilogue, Harry is almost 18. The epilogue is said to be 19 years later. So, he must be about 36 or 37 years old.

Answer 3

Harry is 17 years old at the end of book 7.