Growing old or Growing up - what's the difference?

For my walk today, I did not go along the lakeside but ventured into town. When I reached the top of town the sun came out, but only for few moments. During this time I spotted and photographed a group of 4 older people, individuals, characters, couples, friends... who knows.

When I look at this photo now I see a group of people, individuals, characters, couples, friends who are actually ageless. Their body language reminds me of a group of young teens hanging out in a school yard or park. I don't know, but something strikes me about their ageless, almost naive and innocent air they seem to illuminate.