I am a 16 year old male and my voice sounds horrible, I mean still better than average but still I find it terrible, so I would like to know if I can still train it at this age or is it too late because I'm old now. To be precise, my objective is to be able to land higher notes and for my voice to sound better for the ears.
As a singing teacher I can tell you as have the other contributors, that you are not old!! Your physical body is still growing and fully shaping and that includes your larynx.
I liken learning to sing to training for a marathon. Both involve training muscles groups that have otherwise only be used for 'normal' day-to-day activities, both involve learning techniques to get the best from these muscles and both require you to gain stamina in using these muscles.
I teach the anatomy of the larynx and HOW we create sound before I then continue teaching further technique as this is absolutely crucial. In most cases, if you can speak, you can learn to sing. It's about muscle recognition, muscle memory, ear-training and practice!
Teaching someone to sing, understanding technique and anatomy is different to then building on this by teaching a specific style (like in your case the singing of the Quran).
I have students of all ages from 7-70, so 16 is not at all too old.
Knowledge and understanding, and then practice really is the key.
I hope this helps and happy vocal journey.
Shout up if you want any more clarification.
You're 16. Presumably, you just recently completed the change of voice that comes with puberty. You're at the age where many many successful musicians started in their first bands. You're NOT OLD! And if you're serious about improving your voice, find a good vocal teacher in the style you want to sing, let him or her show you the correct technique so you don't wreck your vocal cords, and then practice.