Why not? Yes, it’s better to have followed good posture practices right from the beginning of your life. However, it’s always better late than never to improve your posture.
The first step towards improving your posture is to start exercising and focusing on strengthening your core muscles like abdominal and lower back muscles, which connect the pelvis and the spine.
If you aren’t sure where to start, you can start using a posture corrector brace. It will help correct your posture by enhancing the shoulder and back alignment. It will also help avoid slouching and hunching.