How old is too old, you cant put a number on that as chronologic age is not as important as overall health. (scoobysworkshop.com)
For authors submitting books in a series for review, BookLife recommends you register one title at a time (and in chronologic order), thus allowing PW's editors to assess each book in your series independent of subsequent volumes. (booklife.com)
Many of them began as chronologic reconstructions. (drtimball.com)