No its not. Weeden's age doesn't matter that much. Why? You'd be lucky to get a QB playing for 10 years! If he was any good, which he wasn't, it would not have been that big of a deal. Roger Staubach played 10 years, and earn a spot into the HOF, grabbed super bowl rings. He didn't start playing at the same age as Weeden.
Why would anyone be fixated on age for the QB position? It's not about age, its all about health and ability to play. They aren't relied on their athletic ability, minus the RG3's of the world. They take a few step backs, and throw the ball. It's no different why pitchers can still go into their 40's, and still perform at a high level. You lose your speed and mobility more, but arm strength and accuracy last a lot longer. Hell, a 60 year old Nolan Ryan was still clocked at throwing at 90 mph.
His age is only glorified, because he happens to flat out stink, and its just icing on the cake knowing that Weeden is older than the rest, but is so freaking awful too.
The only thing relevant here is whether Weeden was good, and he wasn't. He was horrible. He's not bad because of his age. If he could play at a high level, no one would give a shit if he was 70.
Stafford's age and Weeden's don't mean one thing at all, because one QB has more experience than the other. That's not a serious justification toward Weeden. He's horrible, I know he is. But there's no justification for Matt Stafford to STILL be making Weeden like, dumb mistakes, regardless of his age. Because he's played the damn position a lot longer! You make it sound like 25, is 13.
There's not a big difference, at all, between the ages 25-30, when it comes to maturity, and growth as an adult. Not really. Minor differences for most, considering the individual. Both are still rather young individuals, and no one at the age of 30 is seriously seen as a superior adult in the real world. They're still referred to "kids".