Some people here saying the same age you work and pay taxes and I absolutely agree, but with the caveat that it shouldn’t be compulsory before age 25.
And I pick 25 as it’s the average age iirc the brain is considered to be fully matured.
I personally had no clue of what I was doing and regret my first few rounds voting. I was aware at the time that I lacked the information and the big picture view of the political situation to make an informed decision though, and wished I could avoid voting entirely but in my country it was compulsory.
I’m also afraid to ask dw