I think we will confirm life within 50 years by reading the spectra of distant planets and finding free oxygen in the atmosphere. As far as we know, that can only happen if living creatures are replenishing it.

I think it's unlikely that we will find life anywhere else in our solar system. It's possible that we'll evidence of past life on Mars, but not current. Basically, it's just way too cold or way too hot everywhere but Earth.

edit to add: I hope we do not discover intelligent life until we travel to distant star systems ourselves. If it discovers us here, the outcome will almost certainly be terrible for us, based on the long Earth history of species encountering species.