Most people learn a second language while in school. They may not be proficient in the language, especially if they do not have the opportunity to speak conversationally in that language. However, the opportunity to learn another language comes with many benefits.
Learning a new language also provides a boost to our brains by improving memory, creativity, attention span, and reducing cognitive decline. It's never too late to learn a new language. However, it is easier the earlier you start. That also means children tend to master a second language faster than adults.
source: https://nationaldaycalendar.com/learn-a-foreign-language-month-december/