I use wise, and wise means "smart".
I don't think it is appropriate to use maturity. Maturity has several meanings. The main meaning is that when used as a verb, a child or cub becomes an adult, fully grown up and fully developed in character and behavior; When adjectives are used, they mean maturity, which is a bit far from the meaning of "smart".
1 verb
When a child or young animal matures, it becomes an adult.
You will know what will happen when your child is physically mature. ...
= grow up
2 verb v
When things are mature, they reach a state of complete development.
When trees mature, they are cut down in some areas. ...
3 verb v
If a person is mature, his personality and emotional behavior will become more mature.
I hope that after three years in college, I will become mature. ...
4 ADJ approval
If you describe someone as mature, you will think that they are fully developed and balanced in personality and emotional behavior.
They are emotionally mature and should act responsibly. ...
5 verb v, be V-ed
If something like wine or cheese is ripe, it will be left for a period of time to give full play to its taste or strength.
Unlike wine, brandy can only be ripened in wood, not in a glass.
... a cellar where cheese is ripe.
6 ADJ is usually ADJ
Mature cheese or wine is left for a period of time to give full play to its flavor or strength.
Grate some ripe cheddar cheese.
7 verb v
When an investment (such as a savings policy or a pension plan) expires, it is time for you to stop paying the funds, and the company will return the money you saved and the interest earned on your money to you. (business)
These bonuses will be paid when your savings plan 10 expires.
8 ADJ's courtesy
If you say someone is mature or mature, you are politely saying that they are middle-aged or elderly.
... a mature man who has worked for a long time in the memory of most members.
The above explanation comes from Collins dictionary, see mature entry.