What a load of crap you just spouted.
The last two developers we've hired: 1 perl developer (mod_perl) happened to be in his 40's. The other, a .Net developer, too, happened to be in his 40's.
And quite honestly, I don't recall either's educational background. But I can tell you were each has worked, what they di, what their references said about them, and theirs skillsets. I'd also venture to say, IMHO, they were hired for capacity and willingness to learn. Not everyone knows everything. But that you *can* and *want to* learn what you need to learn is key.
Besides, if you are paying someone proper $$, if they are older, generally they are more stable then a young pup who's dating and then gets married and needs to relocate because the spouse got a job somewhere else and they can easily do so without kids. The older hires tend to be married with kids, and they're stuck in town. Especially if they're gearing up trying to save for kids that'll be in college in a few years. Less movement and more stability++.