Is calling a old human male "old man" impolite?

Not really. I call em young man they seem to respond better with a chuckle

mostly yes, depending on the context of the statement and your relationship with or to him.

depends on how you say it

if you do it as a term of endearment I think it's pretty neat

I've earned my years

I call myself that. ;)

yes child

I feel like it's more polite to say [i]older[/i] man. Only because so many people associate "old" with something bad.

It depends on the context, sweetie. 😊

I prefer callin em crusty pricks personally

Depends on how old?

I believe the pc term would be elderly

Neil Young didn't think so.

Depends.

I'd say it's disrespectful if he's not a good friend.