If you are looking for ways to keep on contributing after retirement, consider the unlimited potential for good in your ongoing Christian discipleship.
Is it unrealistic to expect to follow Christ Jesus in healing the sick? When this writer made an effort to do so, she found not only healing but a fresh view of reality as well.
The cynic may say that "spiritual experience" is self-indulgent fantasy. But the spirituality Christ Jesus showed us is neither self-centered nor make-believe.