Hey @tee-em I did the same thing as you when I turned 50. Gave up the booze and sugar and hit the gym really hard.
I need to be there to look after my wife (without adult supervision she would get into all sorts of mischief) .
I've not looked back. i feel so much better, so much more alive, so much more positive about the future.
So on the days when it's hard, just remember, it's better to do it now than wait another 10 years and be doing it in your 50s.
Trust me hehehe