Can't I say like "I am (was) experienced."?

[Dimitros]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #115 "Tense Agreement", question 3

When he was only thirty years old, he ......... already experienced what most people only experience when they are much older.

(a) has
(b) had
(c) is
(d) was

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #115 "Tense Agreement", answer 3

When he was only thirty years old, he had already experienced what most people only experience when they are much older.

Correct answer: (b) had

Your answer was: incorrect
When he was only thirty years old, he was already experienced what most people only experience when they are much older.
_________________________

Can't I say like "I am(was)experienced."?

Dimitros

[Mister Micawber]

.
Not with a direct object. This sentence has a direct object ('what...older').
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[Molly]

I am/was experienced (in something). - "Experienced" is an adjective there.

I (had) experienced (something). - "Experienced" is a verb there.