Contact Mark at NPWS in Gosford. He will send you a brochure.
The fit retirees mostly walk on Saturdays but there is a reasonable group of retirees that walk every Thursday, I think its in Yarramalong this week. There is also a group on Monday but they ramble. Its not a formal group but you do have to book in with Mark and there is a cost ($7?).
The Discovery program on the Central Coast is very active and I often walk with them. Its the large population of retirees
regards
Bron