What determines the strength, pitch and timbre of the voice?

From the length, elasticity and structural features of the vocal cords, and this, in turn, depends on age, gender and individual characteristics. Women have a higher voice than men because the vocal cords are shorter. The timbre of the voice is formed at the end of puberty.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.