Gagan Singh’s Answer
I'm a former investment banker - worked at Barclays in NYC - and entered the field at 29! I entered investment banking (as an Associate) after I completed business school and I definitely didn't feel old. There are 2 ways that most folks enter investment banking:
1. As an analyst. These folks enter IB right after completing college and are generally 22 when they start.
2. As an associate. These folks enter IB after completing business school and are generally 28 - 32 when they start
I do agree that the job is more suitable for "young" people since the hours aren't necessarily conducive to a healthy marriage or being an engaged parent. However, I would define "young" in this instance to mean younger than 35, rather than younger than 25.