Extremely useful archive of 89 crisply rendered images, each in 3 sizes for added flexibility, of those past middle age in a variety of activities, situations and poses: studying, writing, shopping, at meetings, with grandchildren, visiting the doctor and dentist, in romantic vignettes, and more. Immediately usable and royalty-free.
Here's a sample of other books in this Dover category
Ready-to-Use Signboard Mortised Cuts by Leslie Franz Over 250 royalty-free illustrations — 127 designs, each in two sizes — incorporating blank spaces for advertising copy or other messages. Designs in shape of coffee pot, fish, tooth, eyeglasses, more.
Ready-to-Use Illustrations of Women’s Heads by Tom Tierney Here are 312 new designs in sharp black-and-white on one side of a page, ready-to-use and copyright-free, of women's heads: women talking, laughing, working, making up, playing, and just being contemporary.