Every two weeks for the past 34 years, Marcos Perez spends two hours donating blood at the South Texas Blood & Tissue Center.
The 57-year-old postman just passed the 100-gallon mark, saving thousands of lives in the process.

Perez donates platelets, a blood component that allows him to donate more often than if he were donating whole blood or double red blood cells.
“They might live an extra day, a year, a month, who knows. Maybe they will live forever,” Perez told…
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