Maturity is not in any way related to age. How much you expect from someone is entirely relative. People are different, some know more and some know less. One thing is always true: There's always something they know that you don't. Even a person who has been locked up in a cell without windows from birth to death could share something amazing with you.
You know what, you're completely right. Tony is 25 and quite immature for the standard. However, pulling the whole "everyone is unique" and trying to turn my words into a philosophy you obviously are just dodging the statement.
What is the reason for the negativity towards Lord Tony right here and now? Explain yourselves.
Because he's an egotistical arrogant idiot that is generally unlikable. I'd bet money that 99% of people who defend tony are either just like him, or kissing his ass.