Welcome. I ran from age 39 to 49. I lost interest. That's the only reason can think of. I eventually got fat and started walking and lost 34 pounds. I then started SS at age 66. It's one of the best things I ever did.
You've made good progress for just 2 months. Keep up the good work. Find a certified SS coach and either consult with him/her from time to time or have him oversee your lifts.