Yes, there are times when some members act their shoe size rather than their age.
But ... when it comes to where we walk, what we wear, what we drink etc, we are all very mature.
If you're walking in Britain, take some tips from those who know:

Don't drink and drive.
Always be prepared for it to rain, snow or blow a blizzard, especially if you intend to be on any hill top.
Wear comfortable, strong shoes or boots.
Wear clothes which will keep you warm, but which can be carried if they are not needed.
Consult the weather forecast and take it into account before setting off on any walk.

At the start of your walk, park your car legally and with consideration.
Don't overdo the pork scratchings.
Don't overdo the length of your walk - always know your limitations.
Always use the correct Ordnance Survey map in conjunction with all our walk descriptions, which always assume you are doing so.
Don't take it too seriously and don't worry if you get your boots dirty.

But the most important rule of them all is to use your day out in the fresh air to enjoy yourselves and, as long as you're not breaking the law or harming the environment or anybody in it, turn your body clock back a few years.