747 forever,
It is possible and achievable.
I have a friend who got his COMMAND on B777 at the age of 28 with a legacy carrier. At that time he was the youngest in his company (and still stand until today) to achieve the command status on B777. This is how he started his career.
Age 20 - Graduated from flying school.
Age 21-22 - Flying B734 as an FO.
Age 23-25 - Flying B744 as an FO.
Age 26-27 - Flying B734 as a Capt.
Age 28 - Promoted to B777 Capt.
Today he is a TRE/TIRE on B777 and he achieved that at the age of 31. He was the lucky one because he hit 3500 TT (minimum hours in his company to get promoted to a Capt) at the age of 25 and had an outstanding performance in all his training/check records + there was a vacancy for a promotion.
You have to be at the right place and time in order to achieve that as well as good track record.
VR
