I'm 40-49, but I'd take on my 20-29 year old self any day (when I was supposedly at my best). Lots of life skill in younger years that turns into super powers!
Age can be considered a badge of honor. It is the point where I would do things and not think about it, now wisdom tells me to think about it and not do it.
Ever heard of "old man strength"? My legendary great-grandpa (from Hampton County!) was fed up with a garbageman and told him that he could "throw your *** over the fence."