Yes, as Pellicle noted, we've had a few on this site who have reported short lifespans for their animal valves. Valves usually don't last as long in younger valve recipients.
It's been speculated that, because the younger people who receive valves are more active than the older recipients, the valves are put through more stress (and more use), so they fail more quickly.
A short while ago, I'd have been very critical of young people who chose tissue valves just so they can avoid warfarin. I still, mostly, feel that way. Having a mechanical valve that will probably last the lifetime of its recipient, and having to go through the really almost insignificant task of warfarin dosing and monitoring, made the decision to go mechanical almost a no-brainer.
BUT -- research seems to be getting closer to alternatives to mechanical valves (they aren't there yet) (TAVI/TAVR), they're at the very beginning stages of testing a valve with a bioengineered material, and I'm sure there are other approaches being taken. It's still a gamble for anyone getting TAVI/TAVR or more traditional tissue valves whether or not a repair or acceptable alternative will become available before the current repair fails -- and second or third (or fourth?) surgeries are always more difficult than prior surgeries. So - the concept of avoiding a mechanical because there's something just as permanent (or easy to repair), may not be that unreasonable.
For myself, if I had to choose again, I would probably still opt for mechanical. Their track records are exceptional. And, some time in the future, an alternative anticoagulant will probably become available. It'll probably cost 50 or more times as much as warfarin, cost thousands of times what a shot of Vitamin K costs to reverse the effects of too much anticoagulant, but it will reduce or eliminate the need for self-testing. So - if the choice of tissue is made just to avoid the 'horrors of warfarin,' these 'horrors' may become avoidable (if not any better than warfarin at reducing the risk of clots forming on the valve).