Create a new column AgeGroup with values Adolescent, Adult, Older Adult according to the age value: <18 Adolescents, 18-65 Adults, >65 Older Adults
Replace the character "_" with a space " " from the column country Country
Split the column CustomerID on the character "_" with the Cell Splitter node
Rename the columns created by the split with the Column Renamer node
Merge the columns Email and CorporateEmail with the Column Merger node. Keep the Email when both are available.
Convert the column Newsletter with the Number to String node

Perform instructions 1 and 2 with two Expression nodes. Click Ask K-AI and copy paste the text of the instruction in the prompt.