You make a convincing argument. I had more to say before you used the age card, very true.
That said, many people can jump out of the wood works over a couple years. Till looked awesome against a scared & under-sized Donald. I'm a massive Doland fan, but if you catch him early he will fold. He can take some punishment over-time, but he's not going to let you just KO him with no regard. He started to shell after getting cracked & was taken out early. Excellent style match-up for Darren as he's the longer, rangier, and much larger fighter.
On top of this, Donald looked less physically tight then ever before. I don't know if there was an injury, he doesn't have the muscle/frame for the weight class or what, but he was easily 10-15 lbs. lighter then his opponent & less lean.