Yes. The 25-character code has a redemption deadline (usually 12–24 months from manufacture). After that, the code is invalid — even if never redeemed.
Key Points
Timer starts at activation: Once redeemed, the 1/3/12-month subscription clock begins.
Code expiry ≠ subscription expiry: A code bought in 2020 might expire 2021; if redeemed 2021, sub runs 2021–2022.
Digital codes (email/retail): Same expiry — check "Redeem by" date on receipt/card.