Sir Patrick Stewart poses with his Star Trek: The next Generation co-stars Michael Dorn, Marina Sirtis and LeVar Burton at the Los Angeles premiere of Blunt Talk.

Patrick Stewart seems to be having a lot of fun lately.

One day he's recording silly videos on his Brooklyn rooftop with songstress wife Sunny Ozell and the next he's tooling around town with bestie Ian McKellen wearing matching bowler hats.

He gives ridiculous interviews, admitting that he only recently realised he was uncircumcised.

You might catch a glimpse of him doing a song-and-dance number on TV, where he's headlining his own comedy series, Blunt Talk.

Is Stewart the coolest senior citizen in the universe? Hard to say - he has a lot of competition in that area these days, and it's all from fellow Star Trek veterans.

The stars of the nerdiest franchise in showbiz history have boldly gone where few pensioners have gone before, conquering the world of pop culture with the media savvy of kids one-third their age.

DANNY MOLOSHOK/REUTERS Sir Patrick Stewart and wife, Sunny Ozell, at the 2015 Vanity Fair Oscar Party in Beverly Hills.

Let the old Trekkers teach you a master class in how to extend your celebrity brand to the next generation.

Sure, Stewart uses Twitter to publicise his upcoming projects. He's been talking up Blunt Talk, and he'll alert his nearly 2 million followers about his next televised interview. But he also gives his fans an impeccably curated glimpse of his enviable personal life.

When he announced his marriage to Ozell on Twitter, he did it with a sure-to-be viral photo.

DANNY MOLOSHOK/REUTERS Star Trek star George Takei and husband Brad Altman at the world premiere of the animated film Free Birds in Los Angeles.

But Stewart is no match for Star Trek's social-media giant, George Takei.

The former Mr Sulu is a prolific Facebook poster and tweeter who routinely garners tens of thousands of likes for each of his posts, many of which involve the Internet's favorite hobby - cats - and terrible puns.



PROGRESSIVE POSSE



Many people get more conservative as they get older, to the mortification of younger generations. But Stewart isn't that kind of grandfather.

In a recent viral photo, Stewart was snapped at a movie premiere kissing McKellen on the mouth.



Shortly after, Conan O'Brien asked Stewart about the liplock on a guest appearance, and he basically told Conan to lighten up.



"That is how we greet one another or say goodbye," he explained.



"But Ian isn't the only one. I don't want you to think I'm a one-man guy." Stewart then proceeded to give a shocked Conan a tutorial on heterosexual male kiss greetings.

STUART C WILSON/GETTY IMAGES Sir Ian McKellen and Sir Patrick Stewart kiss at the UK Premiere of Mr Holmes in London.

Takei, meanwhile, isn't just here for the baby animal pic; he's also been a vocal proponent for LGBT rights, among other issues, as one of the first Hollywood stars to come out of the closet in 2005.

Although, before that he never kept his committed relationship with now-husband Brad Takei much of a secret.



ALL ABOUT THE KIDS



"Kids today," the old codger refrain goes. But Stewart embraces the younger generation. He is, after all, married to a woman more than three decades his junior. And he's recognised that being part of Taylor Swift's crew is the greatest aspirational goal of today's youth, even if he has to use Photoshop to do it.

And he's not beyond a humblebrag to let fans know how weary he was after attending a music festival. Message: I'm 75 and still cool enough to go to music festivals!

Fred Lee GOOD MORNING AMERICA - Levar Burton of "reading Rainbow" is a guest on "Good Morning America," 10/9/14, airing on the ABC Television Network. (Photo by Fred Lee/ABC via Getty Images) *** Local Caption *** LAVAR BURTON; ROBIN ROBERTS LAVAR BURTON, ROBIN ROBERTS

Few Trek alums have spent as much time ministering to younger generations than LeVar Burton, who hosted children's show Reading Rainbow for more than 20 years - which is why you'd be hard-pressed to find a millennial who doesn't recognize and adore him.

Burton was famous before he wore a banana clip as eyewear on Star Trek: The Next Generation, given that he played Kunta Kinte in the miniseries Roots in 1977. But his years since retiring the character of Geordi La Forge have been spent mainly working on the pro-book children's show.

Further proving his grasp of modern times, when PBS decided to cancel the series in 2005, Burton headed to Kickstarter to fund a new app, and he continues to make videos for the Reading Rainbow website.

STARZ Patrick Stewart as Walter Blunt and Adrian Scarborough as Harry in Blunt Talk.

Stewart embraces the current TMI culture. He's a Lena Dunham-caliber oversharer (see above, the whole circumcision thing) and doesn't mind looking silly if it might elicit a laugh.

On Blunt Talk, he plays an aging pundit with a drinking problem and a cocaine habit. In the first episode alone, he "suckles" a transsexual prostitute, resists arrest by climbing on top of his Jaguar and interviews himself on air.

You know who else isn't afraid to look like a fool? Karate-chopping former Priceline negotiator William Shatner.

James Spader, left, and William Shatner in a scene from Boston Legal.

The man behind Captain Kirk has been dogged by rumors that he's difficult to work with, but once he started to own his arrogance and crankiness, he somehow became more lovable - and more marketable. He did a musical/spoken word album collaboration with Ben Folds, starred in the short-lived $#*! My Dad Says and essentially played himself on Boston Legal.

Up until a few years ago, Stewart was known either for Star Trek, Shakespeare or his role as Professor X in the X-Men franchise. Now? He's a Twitter sensation, YouTube's foremost scholar on the "quadruple take" and a comedian - both in real life and onscreen.

Which calls to mind Star Trek: Voyager star Kate Mulgrew or, as most people now know her, Red from Orange Is the New Black. There she's proven to be a powerful comedic force, an ace at a Russian accent and an actress capable of startling emotional depth. She also recently published a well-received memoir, Born With Teeth.

MARIO ANZUONI/REUTERS Star Trek Voyager's Kate Mulgrew is getting rave reviews for her role on Netflix's Orange Is the New Black.

And then there's Nichelle Nichols, who is 82.

She was one of the first black actresses to star in a television show, the original Star Trek series, which ran from 1966-1969.

Since then, she has continued to reinvent herself as a musician, Broadway star and advocate for space exploration. All of that is pretty exceptional ground-breaking stuff, but she has also maintained a fun, youthful personality and she knows how to connect with the kids these days - through a Reddit AMA.

NASA Nasa Deputy Administrator Lori Garver and Star trek actress Nichelle Nichols look to the sky as they wait for the space shuttle Endeavour to arrive.

Nichols isn't even letting a mild stroke, which she suffered in early June, dampen her spirit. Interviewed by Entertainment Tonight recently, she reported, "I am as wild and woolly as I have ever been."