Calligraphers are generally better in their later years. After all, the older a famous calligrapher is, the deeper his accumulation and skills will be.
Different from painters, there is nothing to portray in the content, the main thing is the skill and momentum of reading the words themselves.
So the older you are, the more sophisticated your writing skills will be.
But if you have a lot of social activities in the later period or you are too old and your physical strength is exhausted, your works will go downhill.
For example, the works Liu Wenxi paints now are far from being comparable to his works of the previous ten years.
Another consideration is that the later you collect the work, the more expensive the work itself will be after it becomes famous, and the more money you will need to spend.
I don’t know if this helps