So, I found two guys from the show "Lioness" - they're part of a special ops team, so military style fighting (ie, a lot of high tech surveillance, rather than a lot of hand to hand combat), but it's at least an active role and they do look the part. Only problem is their imdb pages are very sketchy, short on info. So, no age/height/weight for these guys.
Jonah Wharton
Known for: The Requiem Boogie, Lioness, NCIS
www.imdb.com

He's probably about 36 years old. (His birthday is April 20, but I don't have a year - his first screen credit is 2009 after he was in acting school)
He's taller than Zoe Saldana (who is 5'7") and about the same height as Nicole Kidman (who is 5'11"), so I'm putting him around 5'10" or 5'11". His character on Lioness is named Tex, and his demo reel on imdb has some scenes with him from that show (talking, not action).
Austin Hébert
Known for: Jack Reacher: Never Go Back, Above Suspicion
www.imdb.com

His acting credits also start in 2009, so also probably mid-30s. He is stocky and on the shorter side, so looks burly standing next to Jonah. He's taller than Holliday Grainger (5'1"), but who isn't? I think he's a bit shorter than Jonah, so I would've guessed around 5'7"-5'9" for him....but I also found a picture of him standing next to Emile Hirsch, who is only 5'7"...so definitely more like 5'9". He plays Randy on Lioness, which is also the name of his character in
Above Suspicion. He has played several military-style roles, including in
12 Strong (about fighting in Afghanistan, alongside Chris Hemsworth), and in a 2015 sci-fi movie where he gets special fighting abilities called
The Answer.
Speaking of
Emile Hirsch.....
He's short and a little bit stocky, and under 40 (though just barely, so a bit old to be playing Húrin).
Known for: Into the Wild, Speed Racer, The Girl Next Door
www.imdb.com
Age: 39
Height: 5'7"
Known for: Playing the protagonist of "Into the Wild" (Chris McCandless) back in 2007. He's very skinny for that role, so I didn't really think about him for Húrin. He was also a skinny skater boy in
Lords of Dogtown. But more recently, he plays a hacker in
Pursuit and a gambler in
Dead Money and he doesn't look as skinny as I remember him being.