Calculate age from date of birth in MySQL?

To calculate age from date of birth, you can use the below syntax −

select timestampdiff(YEAR,yourColumnName,now()) AS anyAliasName from yourTableName;

Let us first create a table −

mysql> create table DemoTable
(
   StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentDOB datetime
);
Query OK, 0 rows affected (0.61 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(StudentDOB) values('1996-01-12');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentDOB) values('1990-12-31');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(StudentDOB) values('1989-04-01');
Query OK, 1 row affected (0.45 sec)
mysql> insert into DemoTable(StudentDOB) values('2000-06-17');
Query OK, 1 row affected (0.16 sec)

Following is the query to display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+---------------------+
| StudentId | StudentDOB          |
+-----------+---------------------+
| 1         | 1996-01-12 00:00:00 |
| 2         | 1990-12-31 00:00:00 |
| 3         | 1989-04-01 00:00:00 |
| 4         | 2000-06-17 00:00:00 |
+-----------+---------------------+
4 rows in set (0.00 sec)

Here is the query to calculate age from date of birth −

mysql> select timestampdiff(YEAR,StudentDOB,now()) AS AGE from DemoTable;

This will produce the following output −

+------+
| AGE  |
+------+
| 23   |
| 28   |
| 30   |
| 18   |
+------+
4 rows in set (0.03 sec)