I believe that we could meet someone that we appreciate each other and get a real friendship, even though we are not children anymore, but we have to be patient and do not deliberately look for it.

About what can we do for friendship?

I remmember an bywords - a friend in need is a friend indeed, that means, the friend who could help you when you need the help is a true friend, and that is the time that could prove your friendship. 

Bad times will show your who is your true friend and who's not. And true friend's are unfortunately rare.

and of course it is possible to make new friends , its normal!  People change. Friends you know for years are not guaranteed that they will be always on your side.

there is a quote, something like this:

It doesn't matter how long you have been known someone,its the intention that matters! Someone who have known you for a few days could have a better intention than someone who have known you for years!

我希望朋友遍天下

Miki, you are absolutely right!!! ))) those who know you for a few days can give you more!!!!