Simple Code.
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```python []
class Solution(object):
    def countSeniors(self, details):
        count=0
        for i in details:
            if int(i[11:13]) > 60:
                count+=1
        return count
```
['String', 'Python']