Am I too old to move?

Age is an attitude, not a restriction.
If you fancy it, go for it.

Your wife will tag along. Considering processing times it will be around 12-18 months.
You will not be eligible for government programs as Green Card holders and Social Security/Medicare is tied into employment. Without checking it is somewhere around ten years. Not knowing your professional back ground - will you and your wife have to work and have you looked into employment?

As Fred said, age is not a restriction on anything your heart desires, as long as it's legal and not harmful to yourself or others.

At 55, my husband moved to a country where he didn't know anyone.  At 68, he moved to another country where he didn't speak the language and knew only 2 people.  He has flourished in both countries although his language is still abysmal in this present country.

Life is too short to say "I'm too old to do XYZ."

Thanks for the positive words of encouragement. We would plan to work. I was an engineer in the oil industry for 26 years and that is what took me to the States originally. So right now I'm looking at options for either finding an employer, buying a franchise or starting my own business.

My wife is a doctor and specialises in dermatology and is currently head of her department. Will be tough at her age to get through the US requirements. Perhaps look for an alternative for her.

Thanks for all your replies. The quest continues!