For the past 34 years, Marcos Perez has a special routine. He reaches at the South Texas Blood & Tissue Center every two weeks and spends two hours donating blood. Now the 57-year-old postman has reached 100 gallon milestone, saving thousands of lives. Perez was born prematurely and needed a blood transfusion to survive. Now the ‘babe ruth’ is returning the favor in the most amazing way and he has no plans on stopping his service anytime soon.