MySQL рассчитывает возраст
SELECT DATEDIFF(CURRENT_DATE, STR_TO_DATE(t.birthday, '%d-%m-%Y'))/365 AS ageInYears
FROM YOUR_TABLE t
Lively Lyrebird
SELECT DATEDIFF(CURRENT_DATE, STR_TO_DATE(t.birthday, '%d-%m-%Y'))/365 AS ageInYears
FROM YOUR_TABLE t SELECT YEAR(CURRENT_DATE)-YEAR(t.birthday) AS ageInYears
FROM YOUR_TABLE t mysql> SELECT DATE_FORMAT(FROM_DAYS(DATEDIFF(now(),YourDateofBirth)), '%Y')+0 AS Age from AgeCalculationFromDatetime;