Hey there, Kevin! Thanks for bringing your question to planDisney.
Tickets do have an expiration date, but the value of an unused expired ticket can typically be applied towards the purchase of a new ticket of equal or higher value.
However, this applies to wholly unused tickets only. I believe if one day of a two-day Park Hopper ticket was already used, the second day would have needed to be used within 13 days. Without seeing your tickets, I can’t be certain, so I recommend
contacting a Cast Member on the Ticket Services team to look at your tickets and confirm your options!
It sounds like it’s been a while since your previous trip to the Happiest Place on Earth so I am sending a pinch of pixie dust in hopes you can get to the magic soon!
Please come by and see us if you have more questions!
Kamini