[maren] human immortaly.(upbeat music) my name is maren hunsberger. i'm a microbiologist and i'm fascinated by how the future inspires the progress of science and technology but i'm critical of sensational science headlines that promise immortality. still, all of these stories have prompted me to ask, how quickly am i aging? to find out, i recently took a blood test. i mailed it off annow the results have just come in. i, in like real life, am 26 and we're about to see what this biological aging test says i am. so my biological age, according to this test is 40. learning my body has aged 14 years faster than expected is not the result i was hoping for, but it makes sense. my life partner was recently diagnosed with cancer, and i guess that stress has clearly taken a toll. while i have some doubts about the accuracy of this particular test, i am concerned that stress could further affect my health in the future. so i wanna find out, is it scientifically possible to slow or even stop the aging process all toget

. - [maren] i wanna know what breakthroughs are being made. - we can build an organ that matches your

fred: i got a chance to peek behind the screen thanks to casey maren. >> all of this below the levelor is the original organ. it works beautifully for what it was built to do. it just wasn't quite powerful enough for this room. fred: a st. john's graduate and organ builder himself, he has maintained this one for 45 years. >> you can tell that is in tune. we ended up preserving the old instrument and building upon it. the new organ tops it off and gives it the extra power it needed. [organ sounds] fred: many instruments use mechanical pumps to send air through pipes but this one uses electronic signals. to tune it, he uses a phone app. >> on the control side, things were up currently with the technology. on the sound side, we were back centuries. fred: the pipe organ dates back to ancient greece and its industrial scale evolution came long before the industrial revolution. >> in its earliest incarnations, it made more noise than pretty much anything before gunpowder. fred: michael baroni is a leading historian on the organ and host of a radio program, pipe dreams. >> certainly someone

. - [maren] i wanna know what breakthroughs are being made. - we can build an organ that matches your

the question's only when. - [maren] with dr. horvath's approach added to the mix, i can more clearly see a path toward a future of extended life. - [announcer] in the future, an age reducing dna cleanse comes in a simple pill, taken yearly by people over 50. this therapy scrubs the methylation rust and rejuvenates the whole body at the cellular level. most peoples genetic codes can now be reformulated to the 97th percentile of optimal health, whether 50, 150 or 200 years old. it's possible to feel like you have the body of somebody in their thirties. - [maren] as a scientist, i'm excited about these breakthroughs and the future that science is promising us. but as a human being, there are questions outside the laboratory that seem equally important to me. it seems that on many levels, our limited lifespan has defined who we are as humans, and i wonder how we change if we'd all live until 150 or even longer. just because we n extend our lifespan, should we? and who will benefit from these treatments? will only the privileged bene