As an instructor that has done quite a few start at 14 go solo on 16th birthday then license issue on 17th can't drive a car but can fly a plane.
Wait until you are 16 you get huge breaks in training basically to wait until the calander ticks over it costs you money.
Also as well as you mature your attention span changes Once your 16 you tend to be able to handle a full 1:30 min lesson. Some can at a younger age some can't.
If you want to just get in the air have a look at gliding and also there are various cadet schemes out there and gliding shows you are keen.