Your exact age in both calendars — and why the Hijri number is always the larger one.
If you live in Saudi Arabia you effectively have two ages. Your Gregorian age is the one you grew up with; your Hijri age is the one on your official records. They are not the same number, and the gap widens every year.
A Hijri year runs about 354 days against 365 in the Gregorian calendar — roughly eleven days shorter. More short years fit into the same lifetime, so the Hijri count is always larger, by about three years for every hundred. Someone who is 33 by the Gregorian calendar is around 34 by the Hijri one.
Saudi identity documents record the date of birth in Hijri, so government records show your Hijri age. Employment contracts, passports from most countries and international paperwork use the Gregorian date. When a form asks for your age it is usually worth checking which calendar it means.
Age matters for GOSI pension eligibility and retirement planning. What decides your end-of-service benefit, though, is your service — how long you have worked for this employer — not how old you are.