It's never too late. But unless the content you are creating is either a passion for you (i.e. you don't care if it makes money) or based on a source of income

It's never too late. But unless the content you are creating is either a passion for you (i.e. you don't care if it makes money) or based on a source of income from outside of YouTube (i.e. you are making the content as marketing for another business you own), you may find sustaining and growing a channel a hard task and somewhat demoralizing, if you don't have patience to stay with it for years without any return. It's best to start creating content without the expectation of any monetization and then seeing where it goes. Of course you may become a viral hit, but that's a matter of luck.