Hello,
I have about 30000 MilleMiglia Alitalia miles.

The website states that:
"
MILES EARNED IN THE 2013-2017 EDITION

The current edition of the MilleMiglia Program has been extended to 31 December 2017. Therefore you can continue to earn miles until that date and spend miles for awards by January 31, 2018.
"

Does this mean that if I don't spend my miles by January 2018, I am going to lose them?

Thanks.