When it comes to marijuana use, you’d likely expect someone in their late teens or early twenties to be considered the fastest-growing demographic within the space.

However, based on a recent study, the fastest-growing demographic of marijuana users is much, much, older than you’d expect.

In a recent video uploaded to YouTube by CBS This Morning, it is said that between 2013 and 2014, the number of marijuana users ages 55-and-older increased from 2,812,000 to 4,309,000.

The footage takes viewers inside Harborside Health Center, a California pot shop, where the demographic was most present as Barry Petersen interviewed users on their conditions and how marijuana helps treat what ails them.

Legalizing marijuana retail across the board would yield about $28 billion in tax revenue, according to a recently released report by the Tax Foundation -- which is described as an independent think tank.

The analysis is based on the assumption that a "mature marijuana industry" would be valued at about $45 billion.

That number is derived from exceeded retail sales projections of marijuana in Washington State and Colorado, which legalized the industry in 2012.

The key findings of the report:

With films like "Superbad" and "Pineapple Express" on his resume, Seth Rogen easily one of the reigning kings of today's brand of stoner comedies, so it would be understandable if he found the current wave of marijuana legalization around the U.S. troubling from a creative perspective. But Rogen tells CBS News that he's far from worried about the implications of a more pot-friendly culture.

You're one of the vanguards of modern stoner comedy, if that's not too hoity-toity.

[Laughs.] I'll take it.

As society has been progressing, how do you see marijuana's place in comedy changing?

The 55-and-older crowd is now the fastest-growing demographic of pot users in the country. Between 2013 and 2014, the number increased from 2.8 million to 4.3 million.

In California, where medical marijuana is legal, seniors are learning how to fill their prescriptions -- at a pot shop. They want to know the highs and the lows of marijuana use for the aches and pains of growing old, reports CBS News correspondent Barry Petersen.

Eva Aguillara, 80, uses it to help with mobility.

"Every medication has a risk. I've made my choice," she said.

Cannabis conventions and expos are a great place to meet, interact and learn about every facet of the cannabis landscape from the experts themselves; however, they can also be pricey when you factor in tickets, airfare, lodging and meals. A new event from Green Flower Media though is hoping to remedy the pricey costs and difficult schedule of attending traditional conferences, and is hosting a FREE virtual summit this weekend.

Local dispensaries are pulling pot products from their shelves with yet another batch of recalls hitting cannabis wholesalers statewide. The latest, a voluntary recall by Avicenna Products, affects more than 80,000 concentrates — including wax, budder and vape pen cartridges — that were found to contain traces of pesticides. 

The company announced on May 13 that samples of the products contained residual levels of Myclobutanil, Imidacloprid, Spiromesifin and/or Etoxazole — all pesticides the Colorado Department of Agriculture determined cannot be used legally on marijuana. 

Weed has gone from a taboo substance to a multi-billion-dollar bonanza. The growth of the marijuana sector has created opportunities for investors. Here are four to watch.

Whether you like that marijuana is getting closer to being legalized nationwide or not, as an investor, it's an opportunity that's hard to ignore. 

With four U.S. states legalizing the recreational use of cannabis and 10 more potentially following suit this year, marijuana stocks are going like hot cakes -- or brownies. This is in addition to the 24 states that allow the use of medical marijuana.

The five companies awarded licenses to grow and sell medical marijuana in New York have joined forces to lobby lawmakers for changes to the state's Compassionate Care Act.

“We’re going around giving an update to the program [and] sharing some of our impressions and talking about ways that we think the program can be improved,” said Ari Hoffnung, chief executive officer of Vireo Health, one of the five companies that have formed the Medical Cannabis Industry Association.

The four others are PharmaCann, Etain, Columbia Care and Bloomfield Industries.

Last month, Sports Authority and Aeropostale became the latest major retailers to seek Chapter 11 bankruptcy protection and announce store closures.