We certainly go through different stages in life, reach a peak and go down hill. No one gets out of this world alive. When I was in my early 20's I was a Drill Sgt in the U.S. Army and was trained to kick ***. Then in my 30's and 40's I maintained an edge. In my mid 50's I noticed I was losing a step and this carried over to my 60's At that point I realized I may need a little help so my knife got longer and sharper and I spent more time on the range practicing my "shot". Now in my 70's I have grown to understand what my grandpa told me when I was a young boy full of vinegar. He said, "don't mess with an old man, he will kill you".
To answer the question no, I can not handle myself of 15 years ago because I am on the downward slide of life. Which makes me much more dangerous.