easy solution
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\n/**\n * @param {string[]} details\n * @return {number}\n */\nvar countSeniors = function(details) {\n    let counter = 0;\n    for(let i = 0;i < details.length;i++){\n        if(details[i][11].concat(details[i][12]) > 60){\n            counter++\n        }\n    }\n    return counter\n};\n```
['JavaScript']