Anal size does not become enlarged with age. There are 2 kinds of difficulty that can occur. Some people have nerve problems and some have small anus.
Both are effectively treated by a combination of medical treatment and surgery.
If you feel that it is affecting your life, please consult a specialist surgical gastroenterologist. It will help you enjoy life.
Next Steps
Defecogram
Health Tips
Don't have a quacks treating you. This is a special problem treated by very few and it is not a costly treatment.