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Is that stock you're about to buy really right for you? That was the question Cramer posed to his Mad Money viewers Friday evening, as he dedicated an entire show to exploring the topic of suitability -- finding stocks that aren't just right for this week or this month, but are right for you, given your age and temperament.

Suitability isn't a concept that came naturally, Cramer said, as he reminisced about his early trading days. Doesn't everyone want to make as much money as quickly as possible? Unlike buying a home or a car, which come with insurance, or other merchandise, which can be returned, stocks are a different animal.

Sure, you could buy a stock today that gets a huge takeover bid tomorrow, but you're also just as likely to buy a stock today that gets a huge downgrade tomorrow.

That's why it's so important that you buy stocks that suit you, especially if you're not one who follows the markets on a tick-by-tick basis. Stocks don't have to be a caveat emptor (buyer beware) situation, Cramer concluded, but the buyer does have to be at least a little bit aware of what they're committing their hard-earned dollars to before they pull the trigger.

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Act Your Age

The first type of suitability is age suitability, Cramer told viewers, and that starts with your kids. Parents who start investing for their children when they're born can be well on their way to great wealth by the time their child reaches their teenage years.

Cramer's simple message to parents and grandparents alike: start investing now. One of the easiest ways to get started is with a uniform gift to minors account, where you can gift money now and have wealth accumulate tax free. Check with your broker for details.

As for what to invest in, Cramer said there's nothing wrong with an S&P 500 index fund. That may seem counter intuitive for a guy who picks stocks for a living, but Cramer said the two philosophies can peacefully coexist and he'd recommend giving both a try.

For those with a little more time and know-how, Cramer recommended a collection of names that included 3M (MMM) , Procter & Gamble (PG) , Kimberly-Clark (KMB) and PepsiCo (PEP) , all of which offer both growth and yield. And for those desiring higher growth, you can't go wrong with FANG, Cramer's acronym for Facebook (FB) , (AMZN) , Netflix (NFLX) and Alphabet (GOOGL) .

Cramer's last recommendation for kids: Add a little silver or gold to their portfolio. Precious metals may or may not go up in value during the time you own them, but nothing teaches us about investing basics better than some silver or gold coins.

As your kids get a little older, it's time to start teaching about money and investments. Cramer admitted that it's almost impossible to explain to a child exactly what a share of stock is, but that doesn't mean you can't introduce the concept of owning a piece of a company you can see, hear or touch.

All kids play with toys, so why not start with shares of Mattel (MAT) or Hasbro (HAS) ? How about that box of Cheerios on the breakfast table -- those are made by General Mills (GIS) .

Walt Disney Co. (DIS) is an obvious choice for kids as well, as are household staples made by Johnson & Johnson (JNJ) . And no matter where you fall in the healthy eating spectrum, every kids recognizes the Golden Arches of McDonald's (MCD) .

Buying a brand that kids can relate to is a great way to start them thinking about business and investing, Cramer said, and who knows where those shares will be in 10 to 15 years.

But What Can Our Kids Teach Us?

By the time your kids become teenagers, they're ready to begin teaching you a few things about investing.

That was certainly the case in the Cramer household, where his two daughters were the first to recognize that Domino's Pizza (DPZ) was knocking it out of the park with their new recipes a few years ago.

Cramer credited his daughters with turning him onto Apple (AAPL) , a stock that's still an Action Alerts PLUS holding. No one was recommending Apple when the iPod first debuted, Cramer recalled, but anyone who owned one, especially teens, quickly couldn't live without them.

Cramer said kids, and teens especially, are among the first to spot new trends, whether they be Netflix, Google or Facebook. In his defense, Cramer said he figured out Amazon all on his own.

You can learn a lot from your kids, Cramer concluded, and if you invest alongside, you won't regret it.

Investments Suitable for Grown-ups

After your kids grow up, things get a little more complicated, Cramer said. He doesn't expect anyone to put money away while they're in college, college costs too much. But as soon as they enter the workforce, it's imperative that they invest in a 401(k) or self-directed IRA. Cramer prefers the latter, but either will do.

That's when the mix of index funds and individual stocks comes into play. You need to know thyself, Cramer said, and determine how much risk you're comfortable with. Are you likely to buy more in a sell-off or cut and run? Do you have time to do with homework for a five-stock portfolio? How about a 10-stock portfolio?

As you get older, say in your 30s, Cramer said you should be looking for stocks with dividends, but you shouldn't even consider introducing bonds until you're in your 40s.

By middle age, you should begin the process of transitioning from capital appreciation to capital preservation, Cramer said, but don't be in too big of a hurry. Risk should remain a friend for as long as you're comfortable with it.

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At the time of publication, Cramer's Action Alerts PLUS had a position in FB, AMZN, GOOGL, DIS, JNJ, AAPL, C, JPM, GS.