You do not have to be a specific “age number” to fast in Ramadan; in Islam, fasting becomes obligatory when a person reaches puberty and is healthy and able to fast. Before that, it is voluntary practice and should only be done if it is safe for the child.

Quick Scoop

  • Fasting in Ramadan is fard (obligatory) once a person hits puberty, is Muslim, sane, and physically able.
  • Puberty usually happens roughly between:
    • Girls: around 10–14 years.
* Boys: around 12–16 years.
  • Younger kids are not required to fast, but parents may gently train them with short or occasional fasts if it doesn’t harm their health.
  • If fasting genuinely harms someone’s health (child, teen, or adult), they should not fast and should follow the guidance of a qualified scholar and doctor.

Is there a fixed age like “12 or 15”?

Islamic law links obligation to puberty , not a fixed birthday. Scholars explain:

  • A child is not held religiously accountable until they reach adolescence.
  • Some modern Muslim scholars and communities say that, in practice, many youths become fully responsible somewhere in the mid-to-late teens (around 15–18), especially where puberty and maturity come a bit later.
  • Because bodies and maturity differ, the “age” can vary person to person.

So you won’t find a single universal number like “you must fast from 13”; rather, once you’ve reached puberty and are healthy and able, Ramadan fasting is a duty.

What about children who want to try fasting?

Classical and contemporary scholars encourage gradual training , not strict obligation for children.

Common advice:

  1. Under puberty
    • No obligation at all.
    • If they want to join, they can try:
      • Half-day fasts
      • One or two full days in the month
      • Alternating days
    • Parents should stop or lighten the fasting if the child looks weak, dizzy, or unwell.
  1. Around 10–12
    • Many scholars recommend starting more serious practice, similar to how children are trained in prayer at this age.
 * Still, it is training, not a sin if they miss, especially if fasting is too hard or unsafe.
  1. Mid-teens and up
    • For most teens, if puberty has clearly started and they are healthy, they are treated as adults regarding fasting.

A recurring theme in religious guidance is: do not harm the child’s health and do not make them hate worship by being too harsh.

Key conditions for fasting to be obligatory

Islamic teachings generally mention these conditions for Ramadan fasting to be mandatory :

  • Muslim
  • Sane (sound mind)
  • Reached puberty
  • Physically and medically able to fast
  • Not in a state that temporarily prevents fasting (like menstruation or postnatal bleeding for women)

If any of these are missing (for example, too young, seriously ill, or pre- puberty), fasting is not required.

Forum-style snapshot (how people discuss it online)

Many Muslims on forums say things like:
“My kids start trying half-days around 7–8, a few full fasts around 10–11, and once they clearly hit puberty and are healthy, we treat fasting as obligatory.”

You’ll also see parents sharing tips like giving a strong pre-dawn meal, watching for tiredness, and allowing kids to break the fast early if they are struggling.

Simple answer for “how old?”

  • You have to fast in Ramadan when:
    • You have reached puberty,
    • You are healthy and able,
    • And you meet the general conditions of accountability in Islam.
  • Before puberty:
    • Fasting is not required , but kids can practice in a safe, gradual way under caring adult supervision.

If this is about you personally and you’re unsure whether you count as “grown” in Islamic terms, it’s best to speak to a knowledgeable local imam or teacher who knows your situation and your health. Meta description (SEO style):
Wondering how old you have to be to fast in Ramadan? Learn when fasting becomes obligatory in Islam, what scholars say about age and puberty, and how children should safely practice fasting.

Information gathered from public forums or data available on the internet and portrayed here.