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Also, renew your yp railcard the day before your birthday for another year of 1/3 off travel.

This, but buy the 3 year card online and get it for 3 more years!

Special note
As long as you are aged 25 at the time that the Railcard is purchased, you may still travel at the discounted fare throughout the validity period of the Railcard, even if you become 26 years old during that time. Likewise, 3-year 16-25 Railcards purchased online up until the day before your 24th birthday will be valid for a full 3-years.

http://www.16-25railcard.co.uk/buy-16-25-railcard/railcard-terms-conditions