Examples of using "Aikuisena" in a sentence and their english translations:
Many moths live for only a few days as adults.
"I can't wait to be a grown-up." "Why?" "Because when I grow up I won't have to study anymore."
If you weren't exposed to a language until you were an adult, you are very, very unlikely to ever sound like a native speaker of that language.
If a person has not had a chance to acquire his target language by the time he's an adult, he's unlikely to be able to reach native speaker level in that language.