Go For It
If being an airline pilot is something that you want to do; I say, go for it. Being 25 should be no factor, you are still plenty young enough to achieve any goal that you set for yourself. Your hieght might be factor for the Indian AF( I dont really know) but, your hieght is fine for working as a airline pilot( in the US). Look into your country Air Force and find out their requirements. Best of luck to you,