You'll have an ATP until you die unless you do something stupid. The FAA uses the term "valid" along the lines of "surrendered, suspended, revoked or expired."

You won't be current unless you have three TO & landings with in the last 90 days and a Flight Review within the last 24 months. The FAA dropped the "B" years ago.

In addition, to be current in a plane requiring a type rating, you need a PC in an aircraft that requires a type within the last 12 months and a PC in that type aircraft within the last 24 months.