Point 1: How do you feel about the characters aging? Does no one age? Robin's still a child. Piggy's still looking fabulous. Kermit's not wrinkling. Scooter's still wearing a school jacket.... What do you think? What are some ways--or what are YOUR ways--of dealing with this issue?
I age them, but I explain that as a species or whatever Muppets could be classified as (including Muppet humanoids), they age far slower than the creatures they're based on (if they're based on creatures anyway). For me, I tend to see Robin as an older child, maybe not quite a tween yet. I thought Piggy explained her looks as "plastic surgery", LOL. I don't see why Scooter can't wear his favorite jacket so long as it's not tattered and still fits. Normal humans should be so lucky, LOL.
Point 2: Do you have a single consistent worldview of the muppet family? And if you do, do you deviate from it to tell other stories that don't fit into that cannon. (I do.) Does it give you continuity whiplash, or do you find it freeing to try out other scenarios? I'd just like to hear from others.
I have, I think, about four canons. There's my Comeback King Saga canon, which is an attempt to merge just about every Henson property I've seen. There's Muppets, Sesame Street, Fraggle Rock, Farscape, Dinosaurs, Labyrinth, and Dark Crystal. I've always been a fan of the Muppet Family Christmas, but by having an almost-complete universe (heck, I even included Tinseltown), I can happily imagine what an updated one might be like. And the weird thing is that most of the important plot points should've started by now, since I don't really get down to business in the plot until the year 2011, which it now is. There's my current canon that's in my signature, which is a troubled alternate universe to the above canon. I also have a "video game" canon, where I tried to write Fraggle Rock and Labyrinth (specifically, an adaptation of Forbes' Return to Labyrinth comic, which I sadly didn't finish) as video games. I also have a Kingdom Hearts: Dinosaurs story that fits in that general universe. Finally, I was going to write my own movie scripts. I have a Dinosaurs movie I wrote, Spring Forward, I think. At any rate, the first two canons are obsessively detailed, the first more than the second, I admit. I spent MANY hours watching DVDs, youtube, and reading Muppetwiki to create a uniform timeline as much as humanly possible.
Point 3: What do you do about food? I mean, in a world of singing cabbages, steering wheel fricassee and an out of control chef, do you put much thought into what you have them put in their mouths? Do you avoid the topic of what (or who) they eat?
In my usual canon, I've noted a theory (I don't know if anyone else shares it) that from Dinosaurs to the modern Muppetverse, it appears that "singing cabbages" are relatively new. I tend to waffle or wemble between such things as being natural evolutions or the products of magic. For example, in Dinosaurs, you'd most likely have, say, a "real" dog (and indeed we see that real Labs exist there). You now have "real" dogs, "creature" dogs, "semi-Muppet" dogs (such as Sprocket, who can't speak human well), and "Muppet" dogs, such as Rowlf, who speaks human perfectly. So, I tend to have most eat "regular" food and have "Muppet food" be considered sentient beings in their own right, though naturally predatory creatures wouldn't care very much.
Point 3½: Does anyone else find it, er, weeird to cook/eat common foods while writing with frogs and pigs and bears and The Linguini Brothers? (Looks around guiltily after our Fourth of July picnic...) Just asking.
Not really. To mostly quote Spike, "She's an animal, you're an animal, so act like an animal." I am a member of an omnivorous species. I'm not likely to eat frog, but it's certainly not because I associate with Kermit ... I just think it's icky.