Top 3 reasons why old people get grumpy

Of course, I am an old person, so I should know.
Please feel free to add your own, and maybe I'll change it to the top 10 reasons in another post.

1. Don't have time or enough energy left to care.

I am not intrested in first-world problems. I got real problems centered around health, finances, and not understanding much of what is being expressed by younger generations.

Not so interested, your latte didn't have any foam, as I am in a slip and fall accident when going out to get a coffee in winter.

2. I have put up with and tried to pacify jackasses for most of my life, and it has been exhausting.
I am tired, boss.

So, I am not as intrested in being perceived as nice as I am in repelling stupidity.

3. I am too old to trust everyone after a lifetime of insincere people trying to defraud or get something out of me.

So, when the Nigerian prince wants my money, I am not really nice about refusing.
When a hot hunk on the internet shows up out of nowhere and wants to date me, I am not thrilled, and my replies may be considered sharp.