Old vs older.

[tufguy]

1) You need to talk to old employees to know what the internal matters of this company is.

2) There was an old guy standing at the end of the road.

Have I used "old" correctly? Where and when do we need to use "older"? Do we need to use "older" while comparing two things or people? Like "My white car is older than the black one" or "An old guy came out of the house first then another older guy came to greet me".

 

[emsr2d2]

1) You need to talk to the/some older employees if you want to know what the internal matters* of this company is are.
2) There was an old guy standing at the end of the road.

Have I used "old" correctly? Where and when do we need to use "older"? Do we need to use "older" while when comparing two things or people? Like For example, "My white car is older than the black one" or and "An old guy came out of the house first then another an older guy came to greet me".

I would use "older" in sentence #1 because, while you're not making a direct comparison in the actual sentence, it's clear that you're talking about employees who are older than some others.

Your use of older/old/older in the final two sentences is correct.

*I don't know what "internal matters" means.