What type of school would be best for me?

I am a 43 year old father of 2. I also own and manage a company of about 125 employees.I graduated college some 20 years ago with a Bachelors and never did any schooling after that. I have accomplished more than
I dreamed in professional sense. I am already making plenty of money and I enjoy having my company.
I do have a desire to widen my horizons.
I would like to do some sort of masters program in management…
Something that will enable me to do mostly online course with occasional campus course and visit…
I am in no rush, this could take 3, 4, 5 years.
I have a desire to prove to myself I could finish a masters degree at some point.
I am also specifically interested in management because that is what I have been doing for the past 20 years and it could help me understand my current business from a different perspective…I dont care about what this will do to job prospects, etc…since I plan to be with the company I own until I either retire or sell it…
It would be also nice to be in the company of people who are older and might have had similar experience when we do occasionally meet on campus. Please let me know your thoughts on schools and programs in Boston area that would be a good fit…

Thanks
Ed

Umass Amherst if you can get in. Arizona state both really good online mbas. Google it. There are dozens.