So what exactly was up with Bert's pants?
If you're referring to that clip I linked to, Bert was just probably annoyed at Ernie throwing them around (along with about half of the stuff in the apartment)!
"My pants!" is just a funny but of improv from Frank in the sketch...along with all the ultra-hilarious angry faces Frank makes Bert do.
One time years ago, my sister was in my room watching TV while I put away my laundry. One of the hangers in the closet snapped and my jeans fell to the floor. I looked down and exclaimed "My pants!" in my best Bert voice. My sister cracked up!
As for Ernie and Bert's ages...that's a good question. Anyone ever asked Jim and Frank? Big Bird's obviously a kid. So's Elmo. Oscar and the Count are clearly adults. But what about Bert and Ernie?
Well...I don't know about Bert, but Ernie might be about 6 years old. According to
one sketch, "he has 8 years of grade school, 4 years of high school..." Take that as you will, but that's what Ernie said.
Convincing John