What age do I need to be to apply for a Monolith Debit Card? March 31, 2020 07:30 Updated You need to be at least 18 years old in order to apply for a card. Related articles What documents are required for verification when ordering a Monolith Visa® debit card? When will my card arrive? What is the Monolith Visa® Debit Card? How to get the Monolith TokenCard What are my Monolith Visa® Debit Card limits?