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.
Whatever has happened in our life situation, that is the day to day mind activity that we obsess about, like the past, future etc, is completely on the surface and in the mind, deep at the bottom of the lake as in deep within us, where our soul is, there is peace and calm always. There may be a storm on the surface, but that is not the real world.
We are not our life events, we are not our actions, not our achievements, we are not the past or the future.
We are the beautiful, kind and loving human soul that we will always be, that is there deep inside us.
True worth is beyond the mind, our life situation and the exterior world, it is within and we are always worthy.