Red Sox infield prospect Nick Yorke was just nine years old when Garrett Richards made his major-league debut for the Angels in August 2011.

Now 18, Yorke — the youngest player at Red Sox camp in Fort Myers — was one of a handful of hitters to face off against the veteran right-hander during a live batting practice session inside JetBlue Park on Thursday morning.

“Pretty impressed,” Richards said when asked about his thoughts on Yorke. “Not only with the talent, but with the way he carries himself. I just found out probably a few days ago that he was 18 years old. And I happened to just be walking by and that was the only sentence that I heard. He was talking to somebody and mentioned that he was 18 years old.

“Me being an older guy, it made me stop in my tracks a little bit,” added the 32-year-old hurler. “Because I had no idea this kid was that young. But very, very impressive with the maturity level and how he carries himself. You don’t see that very often. He’s obviously young and he’s going to be in this game for a lot of years. So I’m excited to watch him develop and adjust to this level of baseball.”

The Red Sox selected Yorke with their top pick in the first round the 2020 amateur draft out of Archbishop Mitty High School in San Jose, Calif.

The right-handed hitting second baseman — listed at 6-foot and 200 pounds — was one of 22 non-roster invitees to receive an invite to big-league spring training last month before being reassigned to minor-league camp last Friday.

Through his first four Grapefruit League contests of 2021, Yorke is 1-for-5 at the plate with a single, three walks, and two strikeouts.

Despite being the youngest player at the Fenway South complex, Yorke is holding his own, and he is impressing the likes of Red Sox manager Alex Cora while doing so.

“He’s in a better place physically,” Cora said of the California native last month. “He’s a tall, strong kid. That was impressive. I look and I’m like, ‘Who’s this kid?’ They told me and I was like, ‘Wow, he’s impressive.’”

Yorke, who turns 19 next month, is projected to begin the 2021 minor-league season at Low-A Salem. He is currently regarded by Baseball America as the Sox’ No. 9 prospect.

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