You're right, he was about two months shy of his 80th birthday when it happened.
Boston College hired Steve Addazio? Is that a joke?
I can only assume Jim Bollman was their first option but he turned them down.
The only coach I can think of recently who failed so miserably as to not get another chance was Ron Prince. As long as Bielema only moderately fails at Arkansas, I don't think anyone will hold his exit from Wisconsin against him so much as to not hire him. It's the nature of the business.
To be fair, his spelling, capitalization, and grammar are far better than 95+% of Twitter users.
They lost pretty much everyone important from the 2006 defense, and the 2007 defense was entirely either freshman or role players.
However, the freshmen on the awful 2007 defense turned into the sophomores and juniors of the amazing 2008 and 2009 defenses.