How am I going to get to my weight at age 25 eating ice cream?

To be 25 again, my records show that I weighted 170 lbs when I was 25, and I could do 200 pushups. So I still have to lose about 13 lbs and do 200 pushups to match age 25. 

I was going over in my mind what portion size I should eat? I knew a half ration was too high and a 1/10 way to low, then I saw this Egyptian Proverb. I figure 1/4 is correct. 

Age 25

Portion control