As a baby, Marcos Perez was born prematurely and required a blood transfusion to survive.

For over three decades, the 57-year-old has returned the favor — bigtime.

For the past 34 years, Perez has spent two hours every other week donating blood at the South Texas Blood & Tissue Center, according to KSDK.

And now he is just the fourth person in South Texas to pass the 100 gallon mark for blood donations — which the South Texas Blood & Tissue Center celebrated with a cake and plaque detailing his contribution.

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