This makes me wish I had taken my piano lessons more seriously...! I tried out numerous instruments when I was younger, but only dabbled before giving up; the trick is to persevere and get in that 10,000 hours they say it takes before you can get good at anything. It's never too late though, I've read numerous articles stating that one of best things you can do for yourself as you age is learn a new skill - be it ballroom dance, knitting or another language. The important thing is that it be a completely unique challenge.
As for musicians, we've seen way too many rockers going strong far into their 60's and 70's not to recognize this study may indeed hold some merit; Neil Young, Mick Jagger, Paul McCartney to name a few. Here's two finely preserved relics, Daryl Hall (64) and Peter Frampton (61) to help prove my point. Enjoy :)