That's a sad chart because the teens is the moment to seal true friendships for life, and learn important social and negotiation skills.
I personally have a couple of friends that I see on a regular basis. Our friendship revolves around our common interest for sports. We meet at least once a week, either for training or other social events.
I also have a few more people that I've known for much longer but are living abroad. We see each other very rarely, but I would still consider them as close friends.
Coincidently, an old friend from school that i had not seen for several decades, found my number in a random WhatsApp group and surprised called me this morning.
Lockdowns have taught me the value of true friendship.