红艳艳的木棉花,挣钱不易悠着花。别走弯路读会计，发挥强项做打他。

国内学医的，现已年过50，

-- That's OK, you have the experience many of us do not have.

想回学堂学财会，不知是否现实，

-- A big NO.

-- Not sure who told you this dumb idea.

想听听大家的看法和建议。谢谢。

-- Heath care is still a good industry to enter;

-- Health care need people have education and experience which you have and many of us do not have;

-- Many places need people to Analysi Health care data;

-- As long as you have a PC in home ( I assume you have one ), you can pick up database skill in couple of month;

-- 国内学医的 + Database Skill in USA = Good candidate for Health care data analyst job.

-- Yes, many people successfully did it, you can do the same.