Nothing is impressive after you are 30. No one is impressed by anything other than maybe having a 100 million+ startup. When you are in your 20s, you are impressive and "have so much potential". After 30 you are just some guy who hopefully isn't old and incompetent as far as perceptions go. Same applies outside of programming as well, though I guess when you are in the top 5% or so, people are still somewhat impressed, but the bar is completely different.