When any kind of professional or personal milestone comes around in life, a parent will often catch themselves measuring it by how much their children’s lives changed in that span.

Jon Meterparel can relate. The longtime Boston sports media personality will begin his 21st season as the play-by-play voice of Boston College football when the Eagles open their season Aug. 30 against Fordham at Alumni Stadium.

“I remember when I got the job [in 2005] and had to fly off to Provo, Utah for the opener against [Brigham Young], my son Ben was just a few weeks old,’’ said Meterparel. “Well, he’s a sophomore at Endicott now. I always kind of look back on that and think, God, the time just flies.”

Twenty-one years might seem like a long run, and it is, but he’s still a relative newcomer compared w

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