- International Penfriends (IPF) Since 1967, IPF has provided more than 1.5 million people aged from 8-80+ with penfriends. Our solid membership base, commitment and service has led to us being recognised as the world's leading penfriend club. Individual Application Form School Class Application Form Booklet on Letter Writing and Penfriend Hints Order Form 'People & Places' International Magazine ...members.ozemail.com.au/~penpals