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In this manner, how should a non Sikh greet a Sikh?

You can meet any Sikh any way you like. From Hello to Good Morning to nodding affirmatively, you can meet him with a social smile. you can greet him with Namastay, Salam, Jambo, in which ever language you want, including Sat Siri Akal. He will greet you with equal respect and warmth.

Subsequently, question is, how your Sikh friends greet their elders? When it comes to greeting your elders you must pay your respects to them through the tradition known as 'pairi hath pauna' or 'pairi pauna'. In some regions pauna is also pronounced as launa. However that is not what is important. Once you greet your elder you are to then touch their feet.

Also, what is the reply of Sat Sri Akal?

It's a greeting exchanged with elders in the Sikh community and also a motivational war cry announced aloud before entering the battlefield against the enemies. Bole So Nihaaal..Sat Sri Akal which means Blessed is the person who says.Sat Sri Akal.

Why do Sikhs wear turbans?

All Sikh Gurus since Guru Nanak have worn turbans. Some reasons Sikhs wear the turban are to take care of the hair, promote equality, and preserve the Sikh identity. Sikhs do not cut their hair, as a religious observance. The turban protects the hair and keeps it clean.