If Column is X, display text

[FelVuk]

I have a list of names and all the countries. Column 1 is filled with names and the following columns represent all the countries of the world. In each row, there's an 'X' under the country that person has visited.
On another tab, I'm listing some of these names using the formula FILTER. In the following column I'd like to list every country where there's an 'X' for that person.
For example, in Cell A3, I have this formula: =FILTER(Table1[Name, first name];Table1[Age]=“20-25”;””), which gives Thomas. In Cell B3, I want all the countries where Thomas has an 'X', so that in Cell U3, I will get: Belgium, Tanzania, Poland.

 

[FelVuk]

Are you saying that you don't get the names of the countries with the formula I suggested?

Affirmative

 

[Fluff]

In that case the data you posted is not an accurate reflection of your real data.

 

[FelVuk]

In that case the data you posted is not an accurate reflection of your real data.

The only difference are the names and countries for security reasons.
Your formula gave me #CALC!

 

[Fluff]

Your formula gave me #CALC!

That is not what you said before.
The #calc error suggests that nothing meets the criteria.