Quite the contrary, the technology of a very old advanced civilization would eventually calcify once all avenues of research have been fully explored. One valid option at that point would be to seed a new civilization then watch to see what new technological paths they uncover.
Not just technology either, but societal innovations and entertainments could be revolutionary to a stagnant civilization.
Fun to ponder even though I believe we are the only intelligent life in the universe.
I'd qualify that with 'in the galaxy' and 'at this time'; if you accept the ideal of going from primitive creature to (us) an advanced civilization in less than 25,000 years, it seems reasonable to assume that more could have existed at some point in the past several billion years.