From Longman Dictionary of Contemporary Englishbe going strongbe going strongCONTINUE/NOT STOPto continue to be active or successful, even after a long time He celebrated his ninetieth birthday this month, and he’s still going strong. → strong
Examples from the Corpus
be going strong• The program is 20 years old this month and is still going strong.• I told you I'd put things off until this practice is going strong.• Over at Half House the party was going strong.• When I'd washed up, the ebb was going strong again.• We were going strong when the bedroom door opened. 