C# Pseudo-Code improvement/peer revision
When it comes to pseudo-code there are different standards depending on your organization, target group, etc, but here is my input:

The comments in your pseudo-code are redundant.

17 and 18 should be merged.

Variable declaration (such as 3. Declare String content) are not needed.

Not sure if every Console.WriteLine() is needed. This could be replaced with something like "Display data regarding Agegroup"