Am I Becoming a Curmudgeon or Am I Just Getting More Selective?

What is it about getting older that makes us become so opinionated?

I'm not yet old, but since I'm over 35, the subject is frequently on my mind.

Among myself, my friends and family members over 35, I've noticed a trend.

As we age, we accumulate a growing list of things we dislike and behaviors we don't like in others.

Mine fall into three categories:
Those things or behaviors I dislike.
Those things or behaviors I try to avoid.
Those things or behaviors I despise.

I don't make an issue about things I dislike if I like the person who wants me to do these things with them.

Examples of what I dislike are:
Shopping just to look.
Drinking from small coffee cups.
Toilet paper that's too soft.
Slot machines.
Chihuahuas.
Movies that insist the viewer should cry.
Sitting or standing directly in the sunlight.
People who place appearance above all other qualities.
Spending time with dull people.

The next list consists of items I want friends and family to be aware I have no interest in.

Examples of what I try to avoid are:
Large parties.
Hanging out with snobs.
Spending time with know-it-alls (or anyone who thinks I'm one).
Eating most seafood.
People who whine in order to get what they want.
Gifts emblazoned with advertising logos.
Loud restaurants.

When I despise something, I can't help but notice the people who do it. Generally I feel compelled to say something if I'm present. In the event it's inappropriate to speak up I'll be frustrated and complaining about it later to a friendly ear.

Examples of what I despise are:
Gas guzzling cars.
Shoppers with a full shopping cart who won't let the person with just a couple of items go ahead.
Those who telephone only when they want something.
Effusive drunks.
Religious zealots determined to convert others.
Neighbors playing loud music.
Braggarts.
Pro-lifers protesting outside abortion clinics.
Phone solicitors.

I could spend days making such lists, but I don't need to because I instantly seem to know most everything I don't like, and to what degree I don't like it.

However, by defining my preferences more closely as I gain experience with age, I am also limiting my choices.

Am I becoming close-minded, or am I making better use of my time?

I can't decide. By the way, Did I mention I dislike it when someone can't make up their mind?