Ron Zacapa 23 Sistema Solera Rum

I don't quite understand the concept of "Solera aged". To me, it comes across as a marketing gimmick, where the oldest portion of the spirit is stated, as opposed to the Scotch way of stating the youngest age of the spirit. So because this is a 23 year old Solera age rum, does that mean one drop of it is a 23 yr old? Or 10% of it? 20% of it? Seems shady. Anyway, my take on this one---really sweet. Not bad, pretty good actually with flavors of coffee, chocolate and butterscotch. Also it's a great sipper over ice. And surprisingly despite the "23 years", it's not too woody or oaky. Which is why I think very little of it is the 23. All in all, if you're a fan of sipping rums, this is a great VFM. About $45 for it, give or take. Out of the few runs I've had, I'd still rate the Mezan much higher because it's without additives and sugar. This taste as if there is sugar in it...which to me is a pricier version of soda minus the carbonation