Did anyone playing AD&D use the ability score adjustments on page 13 of the DMG for character aging? 
We never did, because we never really played long enough for the character to age. They also described a process where there was a lot of adding and subtracting and it just didn't seem all that straight forward. Looking at it again, if you did all the math ahead of time for each age bracket this might be interesting options for B/X D&D players who make 3d6 (or 4d6) in order characters. By choosing the age of your starting character you can adjust their ability scores.
There'd certainly be an incentive to play a middle-aged or older Cleric or Wizard -- which is more in keeping with certain fantasy fiction.
Young Adults: -1 WIS, +1 CON
- Elf —100 to 175 years old
- Dwarf — 35 to 50 years old
- Halfling — 22 to 33 years old
- Human — 14 to 20 years old
Mature: +1 STR, +1 CON
- Elf —176 to 550 years old
- Dwarf — 51 to 150 years old
- Halfling — 34 to 68 years old
- Human — 21 to 40 years old
Middle Aged: +1 INT, +1 WIS
- Elf —551 to 875 years old
- Dwarf — 151 to 250 years old
- Halfling — 69 to 101 years old
- Human — 41 to 60 years old
Old: -2 STR, +1 INT, +2 WIS, -2 DEX, -1 CON
- Elf —876 to 1200 years old
- Dwarf — 251 to 350 years old
- Halfling — 102 to 144 years old
- Human — 61 to 90 years old
Venerable: -3 STR, +2 INT, +3 WIS, -3 DEX, -2 CON
- Elf —1201 to 1600 years old
- Dwarf — 351 to 450 years old
- Halfling — 145 to 199 years old
- Human — 91 to 120 years old
