They take a year to flower-or more,than another 16 months to ripen.You might try feeding with "bloom" fertilizer,or even a few ripe apples around some of those plants and cover for just a few days-venting during the day of course.
The do great in pots-but you wont get full sized fruit even though they are delicious.

Stanofh,
I have had some of these plants in my yard for 5+ years. I have not tried forcing blooms. How long does it take and when is a good time to do it?

Thanks

i would use the apple method. do you cover your pineapples at all in the winter? apple peels release ethylene gas which triggers a bloom, i was asking if you cover them because that would be a good time to put some apple peels under neath them so it traps the gas.

I don't cover my pineapples in the winter. How does the apple peel method work? Do you just cut up apples and lay them around the base of the pineapple?

shorembo,
How large are your 5 year old plants? It sounds very unlikely that a pineapple plant would not fruit after 5 years in the ground.

If your plants are 6ft in diameter they should fruit this coming year.

I've included a helpful link on how to force pineapples plants to fruit.

Here is a link that might be useful: Forcing pineapple fruit

I reviewed the forcing info. It mentions three possible chemicals that can be used to force the fruiting:
calcium carbide
Naphthaleneacetic acid
B-hydroxyethyl hydrazine (BOH)

Any idea where to get any of these? They don't seem to come up under regular garden supplies.

cover them in a plastic shopping bag for a week and toss in some apple peels, i would probably do it in a few months right before spring when temps are consistently 70F +