people said that most great ideas and developments in sciences (especially physics and mathematics) are made by young men. For example, Einstein, Heisenberg, Newton, Ramanujan, and so on. Nowadays, we see that most peiople get their phD at nearly 28. Do you think 28 is stilla Golden Period? For the scientists and mathematicians I list above, their "golden period" are around 21~25. Do you agree that, 28 is no longer the best period to do science?