100 gal of honey! Heck yeah, send me some. Seriously, the age of the honey doesn't matter much. The honey will still be good, it may be crystalized and warming it up will melt it. But if you are given 100 gal of honey then enjoy. You have much mead making in your future. Now will there be a difference? Sure, each years honey is different because it is the seasonal flowers that the bees are feeding on. The bees may have fed on a different mix of flowers. But overall if it is from the same hives and the hives were set in the same area then the honey should be very similar. That said, I still hope it is realitivly unfiltered honey. Sometimes honey is heated and filtered to death. Still good on toast but it's lost a lot of quality. Age would not signifigantly change the flavor of the honey and make it go bad.
As far as a Kit is conserned, I find it better to get the items on my own peacemeal. What some think you need you don't. Here's what I would feel that you would need starting out:
Carboy and or Brew bucket (best for 1 of each)
Hydrometer and test sampler
Turkey baster (works as a wine theif and cheap)
Large Mesh nylon bag for the fruit for easy removal
hops bags for smaller additions such as spices or oaking
A teaspooner or table spooner
Large stockpot (at least 5 gal, stainless steel works fine)
A long stiring spoon
A bottle capper and caps
Bottles
**Sanitizer** (very important)
Some powdered detergent to clean the carboy
Bottle brush and carboy brush
a few galon containers for water.
A large funnel that goes into the carboy is useful but not neccessary
Autosyphon and plastic tubing for it
a few airlocks, about double what you have carboys for so you can clean them and have mead going. With the air locks is also a rubber stopper for the caroby, the brew buckets have a drilled hole instead.
I also like to use a Laddle to mix heated water with left over honey in the container and I have a 1 gal plastic pitcher for pouring honey into when I buy it in bulk.
That's mostly it for mead. Some like more stuff as time goes on but you discover what you need as you do batches.
Consumables: Yeast, Yeast Energizer, Yeast Nutrient, Potasium Sorbate, Sparkloid, Honey, Water (not tap), Oak chips or cubes, your choice of adjuncts (IE the fruit and or spices you wish to use)
Hope it goes well for you. Keep in mind many build up equipment as it's needed and this is what I would get as a basic set.
Matrix