Jenny wrote:101!

that's what Aaron weighs
now!!
I haven't been all that thrilled w/my vet, & hearing Barney's weight makes me question her still more. According to my vet, male cockatiels typically don't weigh over about 97g. If a cockatiel runs around 100g, that's an indication that the bird is female. I had read that show cockatiels can be really large, & I remember wondering, when my vet told me that, how reliable that tidbit really was.
Yep, 101g

That's with a fairly empty crop as well. A few days ago I weighed him just after he'd been gorging himself and he clocked in at 106g. I thought the scale was screwing up so used an old one we had and it showed the same!
I'm with you with what your vet said. That sounds very weird to me. I have found a lot of contradictory information out there about the size of cockatiels, but nothing whatsoever that suggests that a way to tell the sex of a cockatiel is by weight. That just doesn't sound right to me at all.
http://toetallybirds.webs.com/cockatielinfo.htm this is the website of the breeder I got Barney from. She lists the weights of adult cockatiels between 80 - 100g, whilst lutinos and some other mutations can often be lighter.
http://toetallybirds.webs.com/ourbreedingbirds.htm If you scroll down to Pair 4, you can see a picture of Barney's parents, Motley and Calico

As you can see Barney's dad looks like a large bird. Also, if you take a peek at pair two (Aidie and Crystal), you can see that Aidie seems even larger O_o. A clear pied hen Aidie and Crystal had (named Daisy because she was bright yellow), weighed in at a whopping 104g when she was 7 weeks old! As a comparison, Barney was 93g at that age.
http://www.exoticpetvet.net/avian/budgietiel.html has the weight as 75 - 125g
http://www.cockatiel.org/tips/weights.html has the weight of adults as 90 - 110g
http://www.avianweb.com/cockatielinfo.htm78 - 125g.
It varies a lot as you can see. From things I've read - normal greys and pieds tend to be on the heavier side - I suspect it's because pied is such a long established mutation, and lutinos tend to be on the smaller side (probably due to the inbreeding in early lutino lines). Show cockatiels are often pretty large (110 - 125g), but that's probably since they've been bred for the larger size.