Here’s how to calculate starting age, based on 1e tables in the DMG.
Race | Fighter | Thief | Magic User | Cleric | Max |
Human | 15 + 1d4 | 18 + 1d4 | 30 + 2d8 | 18 + 1d6 | 120 |
Halfling | 20 + 2d4 | 36 + 2d4 | – | – | 200 |
Dwarf | 30 + 5d6 | 45 + 5d6 | – | – | 500 |
Elf | 130 + 5d10 | 100 + 5d10 | 300 + 7d100 | – | 1200 |