In my opinion, nowadays, the second language is the most important element for getting a job or living in a better life.
As a matter of fact, not learning a second language would not affect too much on your life living.
However, for your bright future, it is essential to learn second language to broaden your knowledge and choices in your life living.
If you are over 30, it might be a little late for you to start learning a new language.
For your child(now or later), it is a good start to educate them a second language.
In my personal opinion, if I have a child, I would make him/her start learning a second language at the age of 7.
As your child's younger, the more he/she learns a second language quicker and more accurate in accent.
The Question Is,
Would you educate your child in his/her young age to learn a second language?