Reaching 50 and beyond?

I will age 50 years tomorrow (8 November). Wow! Am I really that old? When I was a boy, the older generations of uncles and aunties were a colourful group of people. Some were funny, a few were grumpy and there was one or two that I held in awe. In my teens, the age of 50 was like eons away. Now, the 50th mark is here....hmm. I wonder what will it be like, to maintain a good healthy and fit lifestyle...