To improve push-ups after the age of 55, start by focusing on technique rather than number of times to do it. Keep your arms shoulder-width apart, tighten your abs and keep your body in line from head to heel.
Lower your body slowly until your chest is almost on the floor, then push yourself up in a controlled way. When feeling tired, take a short break instead of letting your posture get crooked.
Just starting with 5 push-ups per day has created a more solid foundation than many people think. After a month, endurance will improve, the body will become firmer and more progressive.
In addition to push-ups, you should do planks and push-ups to increase the strength of the supporting muscles. Alternate between side push-ups, knee push-ups and standard postures to improve safety endurance. Every week, try to do basic push-ups 1-2 times and track your progress. With patience and consistency, you will overcome old limits and maintain strength, even after the age of 55.