>>> he once owned venmo, but now bryan johnson says his most valuable asset is time, and he wants toe can with a modern-day fountain of youth, a plan he calls project blueprint. here is abc's eva pilgrim. >> right now is the very first time in human history where you can say with a straight face you may not die. >> reporter: you believe that? >> oh, there is no question. >> reporter: it's hard to believe tech millionaire bryan johnson is 46 years old. but no matter his chronological age, he is striving for the biological age of an 18-year-old. his team of 30 doctors utilize all the latest tech. the plan is rigorous. it's actually really hard. >> yeah, it is. and it burns really fast. >> reporter: at $2 million a year, a life like this is out of reach for almost everyone. >> and this is what i take on a daily basis of supplements. it's alphabetized and we have a yearly supply. >> it's part of his quest to live forever, which he believe mace happen in our lifetime. >> what i've shown is for the very first time, we could potentially think about ourselves improving at the speed of techno