So, I was 15 when Gattaca came out. 15 year old me was very much "Look at the protagonist succeed against all odds! Take that cold science!".
30 year old me is much more pragmatic. The world is changing very quickly, and even though I'm still somewhat young, I know things will get harder for me as I get older (I work in the tech sector; "The Benevolent Treadmill"). I have a wife, and soon kids on the way. I need to be able to get more done in the day, concentrate more, remember more, and continue to constantly learn while competing against kids half my age.
30 year old me would select the best traits for my child(ren) in a heartbeat. I want better for them than I had, as all parents do.