Not keeping score is an important part. A lot of people reach out, then think it’s the other person’s turn.

My dad has maintained a large group of friends into his 70s. People from all stages of his life. He understands people are busy with their lives, and doesn’t take it personally when they don’t call to set things up. He reaches out, he makes the plans, and as a result he has a rich social life in retirement.

I have this example, but still find it difficult. I imagine it gets easier with practice.