Old Dog, New Tricks
You can't teach an old dog new tricks which is good news for you because you're not a dog. Humans have the capacity to learn and grow all the way through to old age (however you define old age). In fact most successful people don't hit their stride until after their 40's (Henry Ford, Abraham Lincoln, Sam Walton, Morgan Freeman, etc). Don't let yourself off the hook. You not only "can" but "need" to learn new tricks in order to advance through life.
Lucky for all of us, the internet exists where we can endlessly learn (for free) from places like Google and Youtube. Challenge yourself to learn a new skill or master an existing skill. Always wanted to play piano? Take a free course. Are you decent at playing piano? Work towards becoming great.
The trick is "wanting" to learn new tricks.