It is nerver too late to start change.
When your motivation is high enough (7 on a scale of 10) then start. If you lack motivation then I have the perfect tip for you: Just start. Duh. And after a view days you will stop again you will say. Yes you will stop, ok, but you tried! Now do the following. Write on the whiteboard in the kichen 3 reasons why you did quid.
After a week you try again and gather 3 more quitting reasons.
Ater a week, take a look at that list. Use it to find the motivation for NOT quitting.
Try again, it is never too late.