the average age at death in the us is 79.3.
what is the average age at death in the us?
79.3
Na
Na
for instance, suppose the "solera" consists of three barrels of wine, and half of each barrel is transferred once a year. at the end of the third year (and each subsequent year), half the third barrel is bottled. this first bottling is aged three years. the third barrel is then refilled with by transferring half of the wine from the second barrel. the wine transferred from the second barrel has an average age of 2.5 years (at the end of year 2, after barrel transfers, it was half 2-year old wine, half 1-year old wine, for an average age of 1.5 years; at the end of year 3, before barrel transfers, it will have aged another year for an average age of 2.5 years). the second bottling will then be half 3.5 years old and half four years old (the wine left in the last barrel at the previous cycle), for an average age of 3.75 years. the third bottling will be an average age of 4.25 years (one half wine that was left over from the second bottling - average age 4.75 years, and one half wine transferred from the second barrel after the second bottling - average age 3.75 years). after 20 years, the output of the "solera" would be a mix of wine from 3 to 20 years old, averaging very slightly under five years. the average age asymptotically converges on five years as the "solera" continues.
solera