אײדער

Comments

"younger than I/me/?"

ikh, mikh, ....?

the most common usage, I think, is with a proposition, either "fun" or "far":
ייִנגער פֿון מיר

"אײדער" is conjunction, so if you want to use it, you would have
ייִנגער אײדער איך
short for
ייִנגער אײדער איך בין

That's sort of what I thought after I got into it. I think I'll go with "mir zein alter fun dir."