Well, the professor explained aging, but it didn't explain why the cells deteriorate, Aubrey de Grey did give an easier explanation about aging,
https://www.youtube.com/watch?v=qMAwnA5WvLc , aging is simply the accumulation of errors or damage in the body, the body repair this errors in life, but eventually, the number of errors overwhelm the hability of the body to repair, then it becomes a battle of time until the body can't go on anymore and just crashes, if we actively help the body to repair itself to a point where the errors or damages never are more than the body can't repair, then we have defeated aging, one body could go on indefinetely; the project will help in a sense, but very far in the future.