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I think immortality is not very subtle people would recognize you never get older.The appearance of aging over a 20 - 50 year time frame is certainly possible. Either as an external modification facilitated by the nanites or via a makeup kit / hair dye. Past that point, you would have to periodically relocate and change identities.
Essentially, I can get married, have children, raise a family, etc. When my wife eventually passes from old age, it's time to move on. I have the choice of sharing my secret with family members and keeping in contact.
Of course, with advancing technology lifespans are increasing. The cure for old age is not that far outside current medical technology. Eventually we'll pass a threshold where advances in life extension will be sufficient to permit an individual to survive long enough for the next series of advances. It's uncertain how long I would even need to conceal my long lifespan.
The current proposition is, the first person to live 1,000 years will be born within 20 years of the first person to live to 150 years.
Traveling in time when nobody's looking. Nothing else would compare.
