Board Thread:Lords of Shadow 2/@comment-21823483-20140313231126/@comment-1256165-20140314073551

That's about right. Some speculation on Gabriel here, but:
 * Gabriel is around 30 in LoS1, that takes place in 1047. That would make him born around 1015-1020. LoS2 takes place around 2057, so Gabriel is around 1040 years old.
 * Trevor/Alucard is born on 1046. So in 2057, he would be 1011.