Cramer's Mad Money Recap: The Reading Rainbow

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Baby boomers are exercising past the age of 50, despite wear and tear on the body, and that trend shows few signs of abating, Jim Cramer told "Mad Money" viewers Thursday in a rebroadcast of an April segment.

There are stocks to be bought on this trend, Cramer said, including the leading company in the sports medicine business, DJ Orthopedics DJ Orthopedics (DJO Quote).

He said that the company has every kind of knee, ankle, elbow and lower-back brace you can think of. Moreover, it just completed an acquisition of "the most important [knee brace] in the world."

The company just bought Aircast Incorporated, "the Moby Dick of knee accessories." And Cramer said that the stock jumped 13.5% to nearly $40 after the deal from about $29 before the deal.

But never buy a stock just because you like the product, Cramer said. That's just what gets you interested in the company, but then you have to do your homework.

He said he would wait for a pullback before buying. He added that the company deserves a 23 multiple, which is where most small-cap orthopedic companies trade. If it earns $2 a share, Cramer said that could take the stock to $46.

You might know how to read, but you need to learn how to read behind, outside, all around the lines to make money, he said.