Stop worrying about age. Shit... 30 is young. You have plenty of time to follow these dreams. Depending on what type of back end development you want to do pic

Stop worrying about age. Shit... 30 is young. You have plenty of time to follow these dreams. Depending on what type of back end development you want to do pick up a book and start learning back end languages. Java, Go, Javascript (Typescript) etc. Also, start learning databases like MySQL or Redis etc. Just make a simple web based notes app or something that will allow you to hit all these back end technologies. Just start!