Maybe like myself, (but I'm old too), the younger new starters into the hobby have by one means or another lots of stamps, but struggle to get the tools etc. needed to go further.
I think when you have been in the hobby for a long time it's very natural & easy to take the basic things for granted & over look there importance to the new younger ones coming into the hobby.
Not everyone has deep pockets or lives in a place where things are readily available over the counter, like remote ares etc. And not all the young use the internet to buy on either because of the set-up system needed & costs. My daughter is an example of that.
I would have been happy to have a second hand perf. gauge at the beginning 3 years plus ago & are only now awaiting the good USA multi-gauge to arrive in my PO Box :)
Things to mount the stamps on or into,hingeless mounts not being used, pages, stock books, old cats., second hand stuff that may not be used but to others would help them out.
The bigger items I would expect most anyone would be more than happy to pay the postage themselves on them.
But things that are sitting around not being used second hand or otherwise may well help many other newbies get a start
Hope the input helps.
Hats off to you & the others with what you give away in stamps, a kind thing to share the gift.