Age is just a mindset, in fact, it is a mental construct.
Now is the only real moment of our lives and always will be. All the time, another mental construct, that has come before no longer exists, it is just a memory in our mind.
Just live each moment and then your age is no longer dominating your self-image, your story of the past no longer influences you now and there is no need to worry about how many years you might have left and so on. You do not have to then think about acting an age!
Life, even on your death bed will always be now not what age you are on your birthday.
How do we choose to react inside to the external world?
Well, we can accept and surrender to what is. Build no resistance or negativity to the current situation. That is an inner acceptance that does not necessarily mean we agree or like the situation we just choose not to fight it internally. We do not have to actualise this externally through actions or words. We just choose to stay calm inside.
Another option is to remove ourselves from the situation. To flee.
There is one more choice, the one that most of us seem to opt for most of the time, continue suffering from our reactions to situations. By resisting what we cannot control and is already.
We can not control the external world outside of us, therefore, when we resist what is, and put up a fight in terms of how the mind and body reacts, then that activates pain and suffering within. It is all negative energy from our thoughts, reactions and emotions.
Surrendering to what is allows us to be free of that resistant mindset and enables us to act out of intelligence and from a position of liberation and peace.
Inner peace comes from choosing to no longer suffer and remove any barriers and resistance to the external world. It is a choice we can all make and we can make it now.