Yes and beyond. I think if you werent told the begining., you wouldnt know the end. You would age slower. Providing you didnt eat, smoke or drink yourself to death. People age because they believe the limits set upon them. They are told at a certain age, your suppose to look this way or that. Remove the restraintsvand live a longer life.
In the past, most people died in their 40's. Before that even younger so I guess it's possible with continued advancements in medical knowledge. However, I don't think it's likely but it is not totally out of the question. EDIT Per Wiki, the record for the longest person that ever lived is 122 years, 164 days.
Oh my gosh! What if the average life expectancy was 150 or 175 years old? What would we feed everybody? Where would they live? One of the reason that people die is population control. We earthlings already are dealing with shortages of all types!