Pros:

• You can learn almost everything
• You can do interesting experiments
• You'll be able to travel everywhere in the world
• You'll have a lot of bdays :)
• You'll have loads of stuff you've collected from all over the world
• You'll get smarter and smarter!
• You don't have to be afraid that you will die
  • this means you can do a lot of more things
• You won't get bored since there are new things invented every now and again

Cons:

• Everyone around you dies
• The earth gets worse and worse as time goes by
• You'll never have rest
• Nothing stays the same, that's kind of frustrating
• If you're in the most awful pain, you can't die, you'll just have to stand the pain and keep living
• What happens if you become depressed? You can't commit suicide
• You'll get frustrated by the enormous amount of music there is