Here's the information for the package you are referencing:
25 Or Under $20 Offer: Offer applies to the cost of (i) upgrading to Assist & Review from TurboTax Online Free, or (ii) TurboTax Deluxe, Premier, and Self-Employed, with optional upgrade to Assist & Review at no additional cost. For 2024 personal taxes only. To be eligible, customer must be born on or after January 1, 1999 and file their personal tax return by April 30, 2025. For spousal returns (which count as 2 returns), both spouses must be of eligible age to qualify for offer. Excludes TurboTax Full Service, TurboTax Desktop, and TurboTax U.S. products.
Offer cannot be combined with any other TurboTax offers.