> I already feel that I'm not as fast as I was in my 20s; I'm turning out 10x better products though, and I can anticipate and avoid many classes of problem I

> I already feel that I'm not as fast as I was in my 20s; I'm turning out 10x better products though, and I can anticipate and avoid many classes of problem I couldn't back then. I am a better and more productive engineer at 45 than I was at 25.