On the one hand, the change of generations is conceived by nature, so the real immortality can not be achieved, I think. But here to extend the period of life - for sure. After all, before they died in 40 - 50 years, and this was considered a deep stature.
I think it's quite realistic to extend life to 200 years.
We are always extending life. It is happening as we speak and will probably reach a stage when living till 150 will be the new normal. Who knows!