Username
Gary44
Member Since
June 7, 2019
Total number of comments
1
Total number of votes received
1
Bio
Your Pain Is Our Pleasure
24-Hour Proofreading Service—We proofread your Google Docs or Microsoft Word files. We hate grammatical errors with a passion. Learn More
It is you who are/is ...
Clearly, it should be "Who are 20 years old," since they are twins, therefore, plural.