Bergeron 'knew it was time' to retire from Bruins, NHL
Physical demands among reasons 38-year-old left game after playing entire 19-season career with Boston
![Bergeron on retirement](https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/eeglf70waablwibwbaz1.jpg)
© Maddie Meyer/Getty Images
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Players reflect on Bergeron's NHL career