Concluding Chapters

I've been writing this book about a 60 year old guy but be darned if I know how to write the concluding chapters.
I mean yeah, he is "only" 60 and may even have another 30 years to live. But still, I cant seem to find an interesting narrative for him.
So how can I make it exciting and credible at the same time? Gets cured from incurable cancer? Quits Catholicism to join Hare Krishna? Overcomes his obsessive hypochondria to get fit enough to climb Mount Killimanjaro? Wins the lottery and gives 1% to charity and spends the rest travelling the world as a famous blogger? late blooming fingerstyle guitarist goes viral on YouTube? Learns how to tickle the funny bone of severely depressed and in the process becomes a household name? "Paperbackwriter". there I can see it in neon lights.
Or here's an idea. Gets off the net, meditates/prays alone for 12 months, then devotes his entire time helping detox overpoliticised people? Starts his own ashram doing same?
I may have just accidentally motivated myself . I might get some twists and turns here at the end of this book, that are totally out of left field. Unpredictable, surprise surprise, surprise as Gomer used to say. Have th reader going "wow man, this Paperbackwriter sure knows how to hook ya!" Best darn book I ever read!