I answered
Go back to age 5 with everything I know now
this question is probably pretty dependent on age. at only 34, i mulled this a bit. if i know everything i know now at 5, my life would be completely different, including probably not having my wife and daughter, but i would still possibly know them, depending on how you interpret the question. still, i look at what i've learned and ignoring my previous point, i think i could probably have a much better quality of life if i knew then what i know now. although it would be interesting to see the toll taken over time if i still knew of my bizarro daughter