I will be turning 41 in October. While I don't look my age, I *feel* my age - not only physically, but I am becoming increasingly alienated from pop-culture and my ability to relate to younger people. I am surrounded by young people almost every day (I'm a university professor.... much like
@lakersfan45 ), and they seem like alien creatures to me. I often find myself saying "When I was your age..." to my students, and making bad dad jokes.
Something that really hit me was finding out that I am classified as middle aged, and that I am older than the median age of the population.