This is quite an interesting question. Although I am probably taking this hypothetical question too seriously, I would like to raise some questions I have and take a stab at evaluating the implications of my own potential answers.Questions:
1) What does losing five years mean? Does it mean losing the last 5 years of my life? Or the next 5 years? Or the five best years of my life (just losing the memories of the best 5 years [ex. Forgot I used to love my wife] or losing the chance to have the best 5 years happening [ex. Not having a wife I even used to love])? Or the five years I am most needed (family)?
2) How is the perfect height achieved? Is it like what LL can give (changing the length of either the femurs or the tibias), or changing the entire body height? (torso length, leg length, potentially arm length)
3) How will I lose five years? Is it five years in prison? In illness? In surgery recovery like LL? Five years just disappeared? Five years of just my life gone, or five years of the whole world gone? Implications:
1) I think losing the next 5 years of my life is definitely worse than losing the last 5 years of my life. They could of course be the same, but hey, touch wood. I assume most people only vague know how much longer they can live and I am sure an 80 year old would not say yes to this question even if the 80 year old wants to get taller desperately. When I am thinking of losing the five best years of my life, it takes some imagination. It could mean, a fortune teller tells me I would meet a woman I love passionately tomorrow and I would love her passionately for five years, then we would lose the flame. Or it could be, if I want to obtain the perfect height, I would just lose the perfect woman since I need to have met her in the five years I traded for a perfect height. When I am thinking of losing the five years of my life that I am most needed, it could be when my future son/daughter is 13-18, when they needed me the most. It could be my parent's last 5 years, when they want to be with their kids, but I gave the five years away.
2) I think changing the entire body is a better deal than LL since it can help people get a body proportion more to what they want. But then, will we get us with a clap? Or it means if we want our torso longer, we have to cut our spine (like LL) then hope it will grow back?
3) This question is a little repetitive of my question one, but since it relates to LL it deserves to be a standalone question. This question probably is what drives most "time-travel" sci-fi books. I can write a ten page essay in answering this question, but then not only I would lose an hour plus of my life, so will everyone that would read my ten page essay (see what I did?
[Five years (an hour plus) of just my life gone, or five years (an hour plus) of the whole world gone? ]). Anyway, I think five year disappeared is the easy way out. Five years in surgery recovery (LL is 3 months in recovery) might make some of us that said yes reconsider their answers (I would).
What this question really makes me think is how much unknown there are in our future. We are definitely losing some stuff for choosing to want LL. We are also choosing to bear some risks. But hey, at least we know what we want, and it is something we are willing to pay for it with time and money.