Magnetars, the most magnetized neutron stars in the universe, present a fascinating but yet enigmatic population. Their birth rate, evolutionary paths, and connection to the broader neutron star population remain open questions in astrophysics. In this talk, I will explore recent insights into magnetar formation rates, their relation to core-collapse supernovae and fast radio bursts. I will also discuss the imprint of their formation and evolution in the pulsar and magnetar spin period distribution, in particular in relation with the newly discovered class of long period radio transients.