Ways to become immortal (3.5)

[Ravens_cry]

Generally, there isn't.
By the Core, you cannot clone, raise, reincarnate, or resurrect someone who has died of old age.

Ah, but there is way to be immortal. Have a druid friend. In fact, have a cult of druids who basically worship you. When you hit venerable, commit ritual suicide,then have them reincarnate you. Bamn, now you're a young adult again.
By RAW, it works like a charm.