There are some semantic debates going on in this thread about the term "bullshit". But there is a clear definition. The paper Stallman links to uses bullshit in the Frankfurtian sense, that is, talk without care for the truth:
> The liar, Frankfurt holds, knows and cares about the truth, but deliberately sets out to mislead instead of telling the truth. The "bullshitter", on the other hand, does not care about the truth and is only seeking "to manipulate the opinions and the attitudes of those to whom they speak"[0]
[0] https://en.wikipedia.org/wiki/Bullshit#Harry_Frankfurt's_con...
How is that a bad thing? Are you the same person you were when you were 15? Of course not. Is it the case for when you were 20 or 30? No. The whole point of living is to learn, gather new experiences and grow. Would you stop doing that because you are immortal? No.
I think author is caught too much in his work whatever it is. Me, personnally would love to meet my grandkids and their kids. Learn and try do new things for dozens of years.
Would this be bad to see the wolrd or even other worlds if we could be able to visit other planets?
I think the main problem is that people are getting old and unhealthy. My grandpa was living for 92 years and I saw that he is miserable. He was fine mentally but his body was failing him. Imagine getting up in the morning and everything hurts. You try to go to the bathroom but your hand are shaking. That is the problem.
At some point you just do not want to live anymore. Because it is just suffering.
> How is that a bad thing?
The point isn't that it's bad, but that it's equivalent to dying and then someone else taking your place. So if it's OK for your character to change fundametally over the span of your life, then it must also be OK for you to die at some point and yield the stage to the next generation.