Miles Heizer became a series regular on Parenthood when he was 14.
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8 Surprising Things You May Not Know About '13 Reasons Why' Star Miles Heizer

3. Miles Heizer became a series regular on Parenthood when he was 14.
In 2010 Miles Heizer became a series regular on NBC’s ‘Parenthood’. Heizer played the role of Drew Holt, the younger brother of Amber Holt (played by Mae Whitman).