I agree with you wholeheartedly. I turn 22 this year. I feel like I'm constantly learning new things. Not
knowledge -- that's easier to obtain than ever -- but hard-won
wisdom. Despite that, the list of things I know I don't know keeps growing longer each day. Age matters. And I don't think the OP was disputing this fact.
Young people are constantly told that they're young and inexperienced and don't know much about life, all of which is true. However, this has a huge negative effect on their self-confidence and sense of self-worth. I'm starting a company, and the words I fear most at a negotiation are "You're still young. What do you know about business?"[1] Not a lot of people say those words out loud, but most people at least hint at them. Those words hurt. If someone points out your shitty business practices or poor hacking skills as reasons to not do business with you, you can at least go back home and fix those problems. If someone says they're not going to do business with you because you're 22, then that's that. I don't know how prevalent this phenomenon is in Western countries, but I feel ageism is a huge thing in India.
You don't realize this unless you try to do things that people your age are not expected to do. Here's an anecdote: a friend -- let's call him P -- once interviewed for a senior-level position at a software company. P loves software and electronics and has deep practical knowledge about both. Not surprisingly, he did very well at the interview. According to the HR guys, he was exactly the kind of person they were looking for. So there he is post-interview, talking with one of the HR people about things he has built, when someone reading his resume notices his age for presumably the first time. Long story short, they swear at him for 15 minutes for wasting their time and tell him to GTFO of the building. All because he is 21 at the time.
This sort of stuff starts to get to you after a while, which is why posts like this one are useful. It's true that age is an indicator of wisdom, but as a young person you need not let that get to you. No matter what older people tell you, you need not let your age be a limiting factor in your success. That, I think, is the essence of this post.
PS: I'm not passing a moral judgement on society here. I don't mean to say that the Indian society should coddle young people. I'm just stating facts and sharing some of my feelings.
--
[1] I deal with very small business in what is often called the "unorganized" sector. People in other industries may have different stories to tell.