Please, explain the use of 'would' in this sentence
I'm only 36, but I feel like I'm too old to understand and explain certain expressions sometimes.. (since this is something younger people would usually say)
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That use of "would" appears in this definition:
American Heritage Dictionary "would"
"6. Used to express presumption or expectation"
The speaker believes that some expressions are most likely to be said by younger speakers. (They take that as a reason for not bothering to understand or explain the expressions.)
Let me suggest a corrected version of your sentence:
"I'm only 36, but I feel like I'm too old to understand and explain certain expressions, since they are things younger people would usually say."