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. In season 4, Monse is around 17/18 years old. Sierra was born on September 11th 1998, which makes her 23 years old. Like Jason, you would never guess from Sierra’s performance that she is 23. She is one of the youngest members of the cast. [Netflix]