They are going to check your date of birth in the passport.
People Also Ask
In general an agent can get in trouble for processing upgrades out of order, and can only then make adjustments if it helps them get a flight out on time. Seriously, claiming it's your birthday or you're on your honeymoon isn't on its own going to get you an upgrade.
If you have elite status with your airline, all you have to do is make sure to request a complimentary upgrade for your booking before your flight or as you're checking in (specific methods vary by airline). Upgrades are given out based on availability, and the list for those limited seats has a specific hierarchy.
On almost every flight, the passengers who get upgrades are either the ones who pay for them (whether in dollars or miles) in advance or frequent fliers with elite status who receive complimentary upgrades as part of their perks. There are very few exceptions, so don't expect to score a free upgrade by just asking.
Original or photocopies of government-issued identification (e.g., passport, birth certificate, government-issued photo identification card) are the only acceptable forms of proof of age.
Children under 24 months are allowed to fly as a lap child and can be added to an adult reservation when booking online. A birth certificate or another form of identification with a birthdate is required to provide proof that they are under 2 years old.
Set up automatic upgrades, so that when upgrades become available, you'll automatically be upgraded to the next cabin class using your Skywards Miles. Sign up for Emirates upgrade alerts so we can send you an email or SMS if an upgrade becomes available for your flight.
From my research, I understand Emirates is very generous in offering every available seat for miles upgrades at airport check-in right through to when the aircraft doors are closed. If a seat is free even when all passengers have boarded, you can seemingly upgrade to it with miles, even on board.