I'm not that old, only a decade and a half of experience, but some things I've been explicitly told:

• it's not enough to be a good programmer, all the immigrants from india willing to do your job for half the cost are good enough programmers. You need to develop your business accumen and your software architecture knowledge.
• That new API/framework whatever is 99% the same as the others, they don't make you better software.
• As hard as it is, be friends with Sales
• Most programming languages are the same to a certain level. It's just syntax, learn the paradigms and you can be a good developer in every language you see, so long as you know the paradigms the language supports

For what it's worth, these are mine:

• Don't be afraid to speak out with ideas or criticisms when you're a junior. You're probably wrong but people will notice you and see you learning etc. Obviously when you're wrong, accept it and then go find out why. Ask your senior / lead why you're wrong, even if you think you know why, you might be surprised
• Ask the duck, dear god, please ask the duck first.
• Stay up to date, but at some point you see that all new developments are mostly minor incremental advances. When someone asks "omg, you haven't heard of X", it'll take you 3 mins on google to know more about it than they do (because you're up to date on all the underlying info). One example is a Java developer I was chatting with, and I mentioned YAML, he'd never heard of it. 3 minutes later he was telling me the inherit problems with it.