I joined Weight Watchers in 1975 when the old program didn't involve counting points. It was really simple and quite limiting but it really worked for me. I lost 49 pounds inn 8 months and have been able to maintain that... give or take 5 pounds.
I am 61 and I run for 25 minutes 5 times a week. I follow the 90-10 rule of eating. 90% of the time I eat wisely and healthily and 10% I eat a junky treat.
The one thing that has stuck in my mind and helped me was something that was said on my very first WW meeting. After we had been weighed and given the suggestion of how much weight we should try to lose, the instructor told us to imagine that weight as a pile of pounds of butter sitting on our kitchen table. Put all that butter in a bag and strap it to your body. That is what we are carrying around with us all day. That visual has been a motivator for me all these years.
Trying to lose weight is really hard work.