Used to be Air Guard, lemme weigh in.

In your 30s, with (I'm assuming) a degree, and a six figure job, enlisting is not for you.

Your peers will be 18 - 20. Your supervisors will be 20 on up.

At basic and tech school you will be older than your drill sergeants and instructors, they will 100% of the time put you in charge of babysitting the rest of your class.

Depending on the career field youre looking for, I'm assuming IT related, youll find more frustration than satisfaction.

Lets talk about home life. No matter what any recruiter tells you, you will deploy. You will be away from your home for extended periods of time, depending on your career field and unit that can mean a few weeks a year or a few months.
The Reserves are as their name implies, they exist as a reserve force for the active duty, to deploy.

If you want to help you local state, the Guard is where you wanna look. Air Guard is a thing.

Now if you read that all as trying to disuade you, I'm not, but you should go in with realistic expectations.

What I think would benefit you is the officer route. You can go from being Joe Blow off the street to Lt Blow in a few months, you dont have to go through ROTC or the acadamy to do it.

Youd find a much more familiar peer group in the officer corps, both in age and experience.

DM me if you have questions.

Edit: gramar

This just came up on my feed. I'm going to say this as a person who didn't serve but had had the same thoughts as you.

It's not that it's too late to enlist... But there are probably better things you can be doing with your time and resources to help your community. Volunteer to teach a course at your local library. Check a local work training facility to see if they need any assistance. Check with local schools and offer shadowing. These small actions are pretty trivial to someone in your position, but could really help improve the lives I've people in your community.

Plan for what you don't want. The military will give you exactly that.

AmeriCorps is also a way to serve.

I served. My only concern would be how physically fit are you?

You need to be aware that most of the other enlistees will be 18-22 or so and you'll have to keep up with them. I served in the army and we had an older guy in my basic that was extremely fit. He did fine but you could tell he struggled to keep up with us during runs. Having been out 18 years now I wouldn't want to try and keep up with the young bucks.

Other than the physical aspect I think it's a good opportunity for most people. The military teaches you a lot and I never regretted joining.

I just wish I wasn't too old to join. I'm in kickass shape, but 55..sigh...