I Want To Be Back In "Schedule/Cost Engineer" Career

I Want To Be Back In "Schedule/Cost Engineer" Career !
Dear Fellow Planners,

I’m 54 years old. Had 10+years Schedule/Cost Engineer experience ie. construction, power plants, nuclear, etc.
But that was in the 1980’s. Then went to Sales Career (not related to engineering) and now retired from it. Now my 3 daughters are soon going to universities! I need to come out of retirement. (NO MORE SALES) I Want To Be Back In "Schedule/Cost Engineer" Career! My first thought is to get certified in Project Planning Software Programs (to catch up with current tools of the trade - technology)....

Am I in the right path to - Be Back In "Schedule/Cost Engineer" Career !?

HELP ME, with your comments, thoughts, advise, and any response to my situation.

I Want To Be Back In "Schedule/Cost Engineer" Career !

Sincerely,
Tony