Sweat Collective

I bought something in store at lululemon today and they asked for my phone number then said I was a member of sweat collective and asked for photo id. After providing it and paying I see that I got a 25% off discount.

I was on a university sports team about 4 years ago for a season and I remember them mentioning discounts at some stores including lululemon.

My question is how long does the sweat collective membership last or is this a mistake and I should have been removed since graduating?