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Statistically, in 1944 CE, about when Earth-1 Kara would have been born at the time, the average age of American fathers was 27-28, making Kal in his 40s at her introduction (!!!); but even if we assume Kara's hypothetical birth was when Kal was about 18 Earth years old (anomalous and scandalous) to somewhat compensate for whatever Kal and Zor-El's age gap must have been, he would have been in his early 30s at the youngest. If Kara was in or close to her mid-20s prior to being de-aged, Kal still should have been middle-aged prior to that.

Action Comics (1938) #241 — fun fact: this issue has the exact same cover month as Action #1!

World's Finest Comics (1941) #235

Superman (1939) #249 & 263

Superman (1939) Annual #11 (aka "For the Man Who Has Everything")

And here's some other media!

Superboy (1988) S2:E18–19

And maybe give a listen to an Adventures of Superman radio show episode in honor of Bud Collyer, the Superman voice actor who also had a June 18th birthday!

Because of serious medical hardships, my mom and I are now facing a 10,000 dollar backpay on our home. My mom just got home from almost two months in the hospital due to a stroke, and other underlying conditions ( IE Hemispheric Migraines causing Paralysis on the left side of her body. )

Because of this she has lost her job, and my income is not enough to pull us out of the hole we’re in.

I’ve already drained my savings and paid 2,000 off of the 10,000, but I only get paid bi-weekly, and our forbearance ends on the 30th with no extensions.

I do not expect the full amount through this, but at this point, I’ve run out of options. If my posts have ever made you chuckle or exhale from the nose, please spread this around as much as you can if nothing else so my mom and I can continue to have a roof over our heads.

(source)

Quite a few of the examples of Bruce or the narration saying the words "life is sacred" are from O'Neil (and many of those predating the Batbible itself), but there are many cases of other writers also having him say those words - in part because it was required for any new writer in the Bat office to read the Batbible for years, but also because it's very easy to come to that conclusion on your own as O'Neil did. Besides those exact words in various combinations you can also find plenty of examples of Bruce arguing about the inherent value of human life, not only in the context of killing but also in the context of needlessly endangering one's own life.

(Nightwing '96 #117, The Question '87 #2)

So yes life is sacred to him, and this is something that's a core trait inasmuch as it's possible at all for something to BE a core trait for a character who's existed for over eighty years. He's deeply emotionally invested in this to the point that you could argue that it's literally what keeps him alive, as also suggested in Batman: Gotham Knights #2.

Batman #529

"Your 'meek ten percent,' Sergeant Bullock would no doubt inherit a far better world"

Gotham Knights (2000) #3

Batman (1940) #217

Detective Comics #1090