Final answer:
The prefix of the word younger is you-. It means 'having the quality of' or 'characterized by'.
Step-by-step explanation:
The prefix of the word younger is you-. The prefix you- means 'having the quality of' or 'characterized by'.
For example, in the word younger, the prefix you- gives the meaning of being more young or having the qualities of someone young.
Other words that use the prefix you- include younger, youthing, and youngerly.
Learn more about English vocabulary