golden years

noun

1. euphemistic, idiomatic, plural, plural only Old age; especially, the leisure years in later life after one has retired from employment. To make the most of your golden years, study the points enumerated above and then resolve to do just the opposite.
2. idiomatic, plural, plural only The period during which someone or something flourishes. The later time of life, when white hairs show that reflection must take the place of action, may well be called golden years.