Old Amp, Still Working?

My neighbour has got a seemingly old tube -amp, that has not been in use for 30 years or so.
Is it possible that it will spring to life after just standing around for 30 years? Or doesn't the tubes last that long?

I haven't got a picture but it appears to be complete, nothing broken. It reads Quad-Amp on the side of it.

Best Regards,
Christian V