an elder brother
a male cousin who's descended from an ancestor who is/was an older sibling to yours or your spouse's
a generic thing

I/me, a male who's (presumably) slightly older than you, or still young enough relative to you to be your older brother
I/me, your male cousin who's descended from an ancestor who is/was an older sibling to yours or your spouse's
I/me, your boyfriend older than you
I/me, your husband
you, a male who's (presumably) slightly older than me
you, my male cousin who's descended from an ancestor who is/was an older sibling to mine or my spouse's
you, my boyfriend
you, my husband
you, a young adult man
you, Mr. or young man
you, the high schoolboy reading this textbook
he/him, that young adult man