Preteen:
**Newsweek
Life
Boy’s Life
**
Once I hit my teenage years:
**National Lampoon
Mad
Magazine of Fantasy and Science Fiction
Fantastic
Sports Illustrated
**
As a kid,
Boys Life
Life
Time
National Geographic
Lots of Comics
Classics Illustrated
Treasure Chest of Fun and Fact
The last two were nominally comics, but heavily educational. I learned more about the French Revolutuion and WWII from the Classiocs Illustrated Special Editions on those events than I ever did in any school class on them. Treasure Chest was a Catholic educational comic that I still love. It stayed away from being heavy-handed, and had great continued stories that ran for 10 issues. It also had short treatments of science, history, and biography – stuff Dopers would love. Frank Borth’s series “How to Draw” was superb (done by one of TC’s stable of artists – who had once done Phantom Lady!). They even had stuff on sports and housecraft that I could get interested in.
I was a latecomer to Mad, but once I started, I didn’t miss an issue until I got married. I was never a big fan of their competitors, Cacked or Sick or Crazy or National L:ampoon.
As a child:
Highlights when I was about 6
Cricket when I was older
Ranger Rick
Audubon (nice pictures; the pollution and endangered animals were depressing)
Reader’s Digest
As a teen:
Audubon
Newsweek
Reader’s Digest (though by then I found it rather lame and old fashioned)
Guideposts (another lame magazine but good for a few laughs)
Rolling Stone and occasionally Hit Parader or Creem
Playboy (we’d steal it from my Dad)
People (silly but sometimes had an interesting article.)
National Geographic
Mad Magazine
As an Adult:
Bird Talk
(Note: I was teenager in the '70s.)
Humor: Mad, Crazy, and (occasionally) Cracked.
Music: Creem, Circus, Rolling Stone.
SF: F&SF, Analog, Galaxy, Amazing, Fantastic, Asimov’s.
I had a subscription to Highlights when I was a kid. I always read it cover-to-cover and occasionally did the art projects.
There was also a magazine called **Penny Power ** (I think that was the name?) (which may be the same as Rhythmdvl’s Pennywise) which I think changed it’s name to Zillions…gosh, I remember reading that thing cover-to-cover. It was about managing your money - for kids!! I totally forgot about this magazine till just now…and it explains a lot about my miserly ways!
There was a Sports Illustrated for Kids. I got it when it first came out. I liked it a lot. Bo Jackson was the shit at the time so I remember reading a lot about Bo.
When i got older my brother and I got Rolling Stone. Then I became offended by RS for some reason and thought they were sellouts and subscribed to Spin in college.
I had a subscription to Cosmopolitan for a while but just cancelled it this year. Realized they start to repeat themselves after a while.
Now I just read Wired. It makes me feel sm4rt.
All those other kids magazines…I never had a subscription to them but I spent a lot of time at the pediatrician’s office so I FEEL like I subscribed 
Did anyone ever have a subscription to Zoobooks Magazine? I remember Zoobooks from the TV commerials that were contstantly on, though I never did get a subscription.
When I was young I read Highlights for a while, and Ranger Rick/Wild* for years (I still have a couple boxes of that somewhere…I preferred the former to the latter though :(). As a teen I had a subscription to YM thanks to my cousin, but I never got to read all of it–they were going to her house rather than mine, and after a few months they started vanishing. Turns out her daughter had been taking them (This surprised me, her daughter is six years younger than me, and hadn’t even hit the double digits yet). My favorite though was a free one I picked up at school called What! a magazine.
I also read, more recently, Reader’s Digest and Time. The latter wore thin around 2003, at which point I was skipping most of the magazine (namely, anything to do with the Middle East), but the only reason I don’t read either anymore is that Mom no longer has active subscriptions. She stopped reading Time before I did I think, but my first year of college she still passed them forward to me.
*My subscription ran so long I started seeing the similar articles to ones I’d read a few years ago.
I had a subscription to Electric Complany, followed by World, Boy’s Life, MAD, and Hot Rod. My brothers had also subscribed to Boy’s Life and MAD so I was reading their '60s issues before I got my own.
My parents liked going to garage sales; they picked up some Smithsonian, Reader’s Digest, and Car and Driver collections when I was in high school.
My first magazine subscription was Sky & Telescope when I was twelve.
My aunt got me subscriptions to Highlights, Cricket, and Ladybug (younger kid’s version of Cricket). Actually I think Ladybug was mine and Cricket was for my older sister but I read both. I also submitted a drawing to Highlights without success, kiz, so I feel your pain. I also read my parents’ Reader’s Digests. I think I was the only one who did; they were also a gift from my aunt. Later when I was 12-13, I bought issues of Seventeen and YM regularly. After that, a friend of the family had a bunch of magazine subscriptions and I would read his old SPIN magazines. Now sometimes I read Entertainment Weekly while waiting for a dentist appointment, but other than that I don’t really read magazines anymoe.
RE Creepy and Eerie- whew! I thought I was gonna be the only one who named them! And of course, Famous Monsters and Vampirella from the Warren group
(I never got into 1984). And from the Marvel group, Dracula Lives!, Tales of the
Zombie and Vampire Tales.
National Geographic (courtesy of Dad), Boys Life, Mad, and Cracked.
UFO Magazine, Ancient Astronauts, and the old standard FATE.
I also read the Pop Lyrics magazine. Hit Parade did have lyrics, but also articles.
I think the Lyrics magazine was a spin-off.
Near my late teens, Christianity Today, Moody Monthly, National Review, American Opinion (the Birch Society’s monthly journal), American Atheist (for a change of pace), Catholic Digest, and whatever religious mags the library carried at the time.
Aaah! Famous Monsters of Filmland! How could I forget? Great stuff. I also read some competitors and spin offs (Anybody remember Monster World? Castle of Frankenstein?), but not regularly.