How old is Monse from On My Block? - Sierra Capri
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On My Block: How old are the Netflix cast and characters in real life?
3. How old is Monse from On My Block? - Sierra Capri
Monse Finnie, like Ruby, is a 15-year-old when 'On My Block' begins but Sierra Capri is a bit older than her. Sierra was born on September 11th 1998, which makes her 21 years old. Like Jason, you would never guess from Sierra’s performance that she is 21. She is one of the youngest members of the cast. [Netflix]