We have 7 billion people on this planet already and the last thing we need is for them to be living longer.
You can't fulfill your potential in 75 years? Why would that change if you had 150 years? Hopelessness in the face of death? I am 46 and that is not even in my thought process yet...
We don't need drugs, technology and genetic engineering to live longer. We need less poverty (better/fairer distribution of wealth), less disease, and less war for a better quality of life.
Who wants to be here in 100 years anyway? I don't want to live in a world of 20 billion people with little resources on a barley habitable world.