I don't think the idea of living forever can really be comprehended, because it's lack of an end. This would require existing past the end of the universe, but that doesn't seem impossible for a sufficiently advanced species. (See: Linde Scenario)

I wouldn't be able to answer this question because of that. However, I'd like to say that I would prefer a life where I don't have a set limit on how long I may exist, where I can choose when it's time to end this life and see if there is anything beyond, or if it's just an eternal rest. 100 years, especially today with all the changes, is not nearly long enough - not being able to see all that will happen in the future would break my spirit so completely and thoroughly.