51.5 here and loving it! finally free from most responsibilties...major ones anyway; the kids are grown and getting on with their own lives. had to retire early due to multiple back surgeries but even that is under control now...so plenty of gardening and road trip time! sure, there are downer times but at what age weren't there? for me, those times are few luckily...just the aches and pains to deal with and good bud usually fixes that.
can't say i'm looking forward to 60 tho...but with 2012 coming up, who knows what's gonna happen...