How do you know when you wisdom teeth start bothering me?

You will know. You will start to feel agonizing pain in those areas.

It is recommended to check them between ages 16-19. At this age range, your bones in the wisdom teeth are still pretty soft and pliable, making it easier to pull out if need be. The longer you wait, the harder the bones solidify, causing for a more difficult removal in the long run and a longer recovery time.

They say you shouldn't really worry about getting them out unless you have problems with them. There are advantages and disadvantages when choosing them to get out or stay in. If you're curious, you can look this up on the internet.