1 man (75 ish) who always provides tea and 3 or 4 biscuits.
1 lady (65 ish) who always provides tea or coffee and 3 "class" biscuits.
1 man (80 ish) who always provides coffee and a 2-bar kit kat.
1 lady (60 ish) who provides tea or coffee and leaves me the biscuit barrel!

1 lady (70 ish) always provides ground coffee (am) or tea (pm) and a penguin
1 lady (65 ish) always provides tea and a cherry bakewell.
1 man (70 ish) who always offers tea or coffee on winter and diet coke in summer.
1 lady (50 ish) who always offers diet coke in summer.
1 lady (30 ish) always provides tea and biscuits
A few others who offer tea or coffee or cold drink and occasionally a bisuit.
So mainly older ones but not all.