Imagining that there is something that a character can do to earn 1 XP a day (and if you've read my 3e posts on NPC classes you'll see where this is going, but it works even better for 1e because of the exponential leveling), then a fighter levels up after 2000 days of training - about 7 years or so. He then levels up again after another 7 years, then again after another 14. He's now perhaps 45 to 50 years of age (persumably he's now also the veteran of several real combats as well) and a Captain and civic leader. He levels up again, but is now in his 70's and aged and his body failing him and he's not able to employ his vast experience as his Strength has fallen to a mere average level and his Dexterity and Constitution are mere 6's. His hit points are lower now than they were when he was lower leveled and youthful. This is very much my demographics in 1e or 3e (A)D&D.