American story?

Question

I'm trying to remember the name of a book about a man who's name I cant remember.He is part of an experiment where a group of people are able to live to be hundreds of years old, he breaks away from the "family". There are several books in the series, written by an American Author.
Any idea?

Answer 1

I think you may mean Lazarus Long:

"Lazarus Long is a fictional character featured in a number of science fiction novels by Robert A. Heinlein. Born in 1912 in the third generation of a long-life selective breeding experiment run by the Ira Howard Foundation, Lazarus (whose birth name is Woodrow Wilson Smith) turns out to be unusually long-lived indeed, living well over two thousand years with the aid of occasional rejuvenation treatments."