Perhaps because the Jewish calendar is so crowded with holidays — many of which last for multiple days — Judaism has little to say about birthdays. However, there is certainly no Jewish objection to celebrating one’s birthday, whether when it falls on the Hebrew calendar, the Gregorian calendar or both.
A number of Jewish traditions are associated with marking special birthdays, such as the second or third birthday, when parents traditionally marked a child’s weaning. The Bible mentions Abraham hosting a feast to celebrate Isaac’s weaning (Genesis 21:8).
Other special birthdays include turning 3, when many traditional Jews cut a son’s hair for the first time — a practice referred to as upsheren — and 13, the age of bar/bat mitzvah. (Traditionally, many girls marked their bat mitzvah at age 12.)
Pirke Avot (5:21) specifies several important birthdays as milestones of sorts:

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The age of five for the study of the Bible; then ten for the study of the ; 13 for the commandments; 15 for the study of ; 18 for marriage; 20 for earning a living; 30 for power; 40 for understanding; 50 for giving advice; 60 for old age, seventy for grey hairs; 80 for special strength, 90 for bowed back; 100–it is as if he had died and passed away.
The group Chabad encourages Jews to mark their Hebrew birthdays by having an (being called to the Torah), reading psalms (including the psalm number associated with their new age), reflecting on the past year and making a donation to (charity).
Use the date converter below (remember to enter your birth year) to find your Hebrew birthday: