Need to retire? Fine. But don't stop living. Don't need to be employed? Great. But stay engaged.
Age means nothing. My favorite example of this is Benjamin Ririe (also spelled Ryrie) of the China Inland Mission. At the age of 80 he decided to learn New Testament Greek. At 90 he took a refresher course in Greek at Toronto Theological Seminary. When he was 100 he still traveled with his pocket Greek lexicon to keep up with the language.
Is there anything more exciting than an older man or an older woman forgetting their age and focusing on their goals? Find something productive to do with your life and you will find that age doesn't matter at all.