I retired at 61, about 18 months ago. Here's the deal...
First, retirement is great. Do what you want when you want with someone else paying for it. Play golf everyday. Start your own business if you want. Spoil the wife, kids, grandkids. It's up to you everyday. The freedom from corporate stress is literally a life changer. Took me about three months to decompress.
Second, the corporate world is changing rapidly. It is increasingly focused on this month/quarter/year's results with ever decreasing concern for the people that make it happen every day. There is no guarantee that any program they are offering today will continue. If the business hits a little speed bump, well, all bets are off (see #3).
I am convinced that the global debt bubble will eventually burst with catastrophic consequences for most folks. So, get it while you can. Ride off into the sunset with a smile on your face. Sign up for Social Security as soon as you can for a little turbo boost to your retirement income (before they change that).
I am set for life and very pleased about it. I am also very grateful for the situation I worked to create (nobody ever gave me anything), but I realize most folks are not and will never be in my situation.