Sharukh Khan is elder than Salman Khan because Sharukh was born in 2nd November 1965 and Salman was born in 27 December 1965. So that's mean Sharukh khan is elder and bigger than Salman khan.
No they r not related to each other, other then that they are good friends/ pals, and they are friends bkuz they work in same film industry, Bollywood. (=