Function calculateAge

calculateAge(birthJD: number, targetJD: number): number
Calculate age in years from birth to target date.
Parameters
- birthJD: number
  Julian Date of birth
- targetJD: number
  Julian Date of target
Returns number
Age in years (fractional)
Example
```
const age = calculateAge(birthJD, targetJD);
console.log(`Age: ${age.toFixed(2)} years`);
```
- Defined in progressions/progression-date.ts:140