Yup don't worry about the age thing guys of 27/28/29 now driving round shiny orange and white tin tubes, and others that are only 21....
As for the sponsorship, well it doesn't really exist as such. You train with CTC, depositing around 60k with them for the cost of that training, they will find you an airline either before or during your training and then once you finish the type rating that money as a "bond" is transferred to the airline who then pay you a cadet salary. On top of that they pay 12k tax free a year back to the bank ( or to you if you just happened to have that much money knocking around ) to pay the training costs back.
The total of your cadet salary and the 12k tax free just "happens" to amount to a normal FO's salary
So you see it's not actually sponsorship at all, but the benefit is of course that that job offer is pretty much a solid bet, barring war, drought, famine, random acts of god, airline going bust etc etc ( you get my point! )
WBV