No one lives forever. Even if average lifespan keeps accelerating to where the average person lives a thousand years, at some point an unconsidered accident will happen, and the private space yacht falls into the sun.
People may learn to live for a very, very long time, and I would love to do so. But,... No one lives forever.
There's the advancing knowledge curve; advancing technology curve; advancing control of nature curve. In a hundred years or less those inter-linked accelerating curves mean business will be able to re-create an indistinguishable copy of any person -- complete with memories and sense of self--"I-ness". Forever.