Gods were invented by people who refused to admit their ignorance of things they couldn't understand or explain.
Every year the list of unexplainable things gets shorter and shorter. Maybe we'll never be able to explain everything, but I do believe it's within reach to understand the aging process to the point of being able to reverse or even halt it. It may not happen in our lifetimes, and the society that figures it out may not be able to deal with the ramifications properly, but they will learn over time. Just as we've done with scientific and technological advancements in the past. Sometimes you can't figure out how to deal with something until you have to deal with it.
But we are becoming gods. The problem isn't with the aspiration, the problem is that we currently suck at being gods and need to get better at it.
Maybe I'm overthinking it, but I feel like that is the classic hubris of mankind to aspire to become gods. We want to control nature and life, yet our limited knowledge prevents us from understanding the ramifications of our actions until it is too late. (Under a White Sky is an interesting read on the subject)