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.
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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').
.
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Native English teacher at Mister Micawber's

[Molly]

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

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