I have been tripped up by this belief that the young 'uns aren't as fit as us old hands.
I managed to persuade one of my recent trainees (who had a good 10 years on me) into running a particularly tough and brutal race. He'd only been running a couple of years on and off and I thought that as an old hand with nearly 30 years experience behind me that I would "wipe the floor" with him.
Sadly he passed me at half way and finished 15 minutes ahead of me.
I learned my lesson - don't start off too fast and don't assume experience will win out in the long run.
It's frozen solid out there, the only piece of clear ground I've seen is two narrow strips on the local trunk road, and walking the dog and staying upright proved a major challenge. I will retreat to the turbo trainer in the garage instead - I'd rather miss a few days training now than 6 weeks because of a broken wrist.