Actually, being older than us doesn't necessarily mean more advanced. For over 100,000 years of being modern humans, we were hunter-gatherers; it is only in the last 8000 years that we developed farming, and everything else came fairly rapidly. But the development of farming came from factors out of our control, so it is quite plausible that we or any other race would have continued as such for many more thousands of years. The idea that lots of time necessarily means technological progress is not really borne out by human history.
True, but I was not refering to an extraterrestial inteligence, i was refering to an civilization which can receive radio signals, which necessarily means that they have some form of technology.
Not only, it is true that we only know farming since the last 8000-10000 Years, but we are speaking of the universe, which is quite old (some 15 billion Years (american billion)) while our planet is really young (some 5 billion years). That leaves a space of many years during which other planets could have developed life while our planet didn´t even exist.
Because it is very improvable that any complex species survives such long time the only way this could happen is through the development of a technological civilization.
This also leads to the following conclusions:
a) Intelligent life has only apeared on other planets recently. (statistically wery improbable)
b) Intelligent life apeared on other planets long ago but it didn´t create a civilization, which would mean they are probably extinct.
c) Intelligent life apeared long ago and has survived until today thanks to the use of technology.
As a sidenote: This last option leads to some interesting questions which deal with the existence of inteligent life in outher space known as the
Fermi Paradox.