It is only this bond of friendship that gives us a person in life that will never become greedy for anything.
They will always be active on finding something that can benefit their friends in one way or the other. We do not have bound to select our friends on any ground including caste, age, sex, creed or any such differentiation that exit within the society.
It is that a friend knows all the realities of his/her friend and helps each other satisfactorily on various issues they may be feeling stranded in. In general a friendship blooms when both the partners are of the same age, background and character but that does not mean people from variant background cannot be best friends.
There will always the bond of love between two people no matter what age group they fall in or which society they are from...