The most obvious voices to answer with here will be Sir David Attenborough and Morgan Freeman. But it depends on your life and its story, also on how you would want to story to be.
Spectacular, romantic, adventurous,... ?
Personally, I think I would like to consider Edward Norton and that not only because of his acting skills and past roles but definitely because of his personality as well.
Yet, if I wanted a more exciting narrative then the two obvious choices would be the two most recent (animated) Jokers: Mark Hamill and Tony Hale. Mark Hamill is a legendary Joker and an obvious voice.
Tony Hale has recently surprised in the “Batman Ninja” but you may remember him as Buster Bluth in “Arrested Development” or, also, Gary Walsh in “Veep”. You can easily check out some of his work on his IMDb profile: http://www.imdb.com/name/nm0355024/
And, of course, not to forget in this list is Jack Nicholson. When I say Jack Nicholson I don’t mean it because of his Joker performance btw, although he is a very memorable Joker. But I’m more thinking about “The Shining”, “One Flew over the Cuckoo’s Nest”, and also his Oscar-winning performance in “As Good As It Gets”.
Lastly, Kevin Spacey, No, not for Frank Underwood performance but for previous work. Aside from being an awesomely written dialogue (monologue) the drive to the desert area in “Se7en”, as well as his entrance when handing himself over in that same movie(“Inspectorrr!”. But the standout performance for me when it comes to Kevin Spacey and voice is American Beauty.
Yes, while like many others I love the voice of both Morgan Freeman and Sir David Attenborough, I would like my life to sound slightly more adventurous.