score:6
Yes and no, you have to buy it before your 25th birthday. But you can use it while you are over 25 if you bought it and validated your first trip before you turned 25.
T-jove for 1 zone
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The use of the T-jove transport card is upheld throughout the validity of the card, even if the user has turned 25 during such period, as long as documentation is provided as proof that the user was under age 25 when the card was purchased and at the time of its first use.
https://t-mobilitat.atm.cat/web/t-mobilitat/suports-i-titols/titols