It seems like rarely a day passes that someone doesn't say something like "Getting old isn't for sissies" or "Gravity isn't kind", or "I'm old, so I cannot read this without my glasses" in front of a podium or on a stage, and while people smile or even laugh, there is an implication that getting old, and aging, in general, is a problem...and while there may be painful emotional, and even physical changes, for us as we gain in years, please consider that we are in a tremendous state of being privileged to get to age.
For the times when you crack, creak, pop or pause, let that notice of what perhaps may sound like your physical limitations instead let those remind you of your physical capabilities. Take a few seconds or a moment to appreciate what you can do...at any age.
If there is a time you feel like you are the oldest, or that you don't belong or fit in due to those surrounding you being younger, keep in mind one person, any person or people, who were/are older than you who imparted knowledge on you, and then choose to share with others who are interested. Think of how fun it is to have the perspective you get to have as you add to your life's experience!
For the times when your body might feel like it does not perform the way it used to perform, from an endurance or strength measurement, allow yourself to focus on being the best you right now. Measure self against self in the moment, and think of the honor you have to feed and exercise your body in a way that serves it well.
For the times when your mind may play tricks on you, or your memory doesn't serve you well, allow yourself to be grateful for all the memories you do have, and all the memories you are yet to make. Decide to enhance the capabilities you have versus dwelling on what you are missing.
For the times others are sharing their issues and even corralling you to do the same, make a mental note of what you like, for which you are grateful, and for all you have, still have, and will have, rather that what once was, or what is gone, so you can, minimally, keep your approach positive...even if others choose not to!
Aging, while it can seem unfair, it is something so many of us hope to get to do with family and friends. We pine for a long, full life, and yet that cannot happen without aging. It is an honor, a privilege, to get to age...yes, hopefully gracefully, and it can absolutely be gratefully, as that latter part is within our control! When we see, speak and even lament over the "problems" of aging, it is difficult to appreciate the privilege of aging, and yet, nearly as simply, when we see, speak and share the privilege of aging, it is difficult to get caught up in the lamenting over the problems of it all!