Youthful
The answer to that question, what is the synonym of old?, is worn out. new
mature, artificial, practical.
trustworthy, sensible, mature, reliable, dependable
Grow the heck up
"Mature" is not a homophone, as it does not sound like any other word. It can be considered an antonym of "immature," as they represent opposite states of development or behavior. However, "mature" does not have a direct synonym that captures all its meanings, though words like "adult" or "developed" can be similar in certain contexts.
Because you have yet to mature.
Fossil is a synonym of old and antique and begins with an F.
No, because there not mature yet. And problems can happen and feelings can be hurt, because their not adults yet. As soon as your 20 or older you can get engaged or even married because you'll be old enough and an adult. Also its illegal to some countries.
old, getting on, grey, ancient, antique, elderly
10 years old's are slightly mature. Let's say the 10 out of 100 precent mature
Yes, because it is not a teen yet.
old fashioned