True, as people grow, they meet new friends in different phases of life. Some friendships, which are only built on just academic discussion and nothing else, will just die off. True friendship - those who share joy and sorrows with you, help you whenever u need it - will last and even bloom.
So far, I have many many friends. Haha that's because I'm considered the relatively more "sociable" person in my circle of friends. However, there are very few whom I consider true friends. I probably have less than the count of the fingers on both hands.
Nevertheless, I'm quite thankful to have met one or two who click well with me at each phase of life, so that I have the motivation to carry on leading life to the fullest.
Hence, here's my reply to him:
Treasure those whom you consider as true friends. Don't let it fade away. They'll be your strongest pillar of support at any point in your life!
This piece of advice also goes out to all readers :)