Bromileads are very short lived,.
once they bloom they are dying, up to a year from purchase, and they will not stop dying no matter what you do.
if you care for them, however, they are extremely fecund.. with pups coming from the base, baby plants coming from moms roots, they will continue nearly forever.
It usually takes 2 summers for a pup to color up and bloom, at which point it's ready to die, and make their own pups.
If you want to continue this 2 year life span, the key is bright summer sunlight as much as you can give it