Honey bees do different jobs as they get older. The young bees take care of the brood, and the older bees go out and forage or gather food.
In the fall, the foraging bees don't look too bad.
Now contrast that to some honey bees out foraging this week.
These honey bees have been in the nest all winter, probably working hard to keep it warm. They are worn out.
Have you ever spotted a honey bee that was worse for wear?